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<title>PSWIGGLE</title>
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<h1 align="center">PSWIGGLE</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#OPTIONS">OPTIONS</a><br>
<a href="#EXAMPLES">EXAMPLES</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">pswiggle
− Plot anomaly along track on a map</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pswiggle</b>
<i>xyz_files</i> <b>−J</b><i>parameters</i>
<b>−R</b><i>west</i>/<i>east</i>/<i>south</i>/<i>north</i>[<b>r</b>]
<b>−Z</b><i>scale</i> [ <b>−A</b><i>azimuth</i>
] [ <b>−B</b>[<b>p</b>|<b>s</b>]<i>parameters</i> ] [
<b>−C</b><i>center</i> ] [
<b>−D</b>[<b>x</b>]<i>gap</i> ] [
<b>−E</b><i>azim</i>/<i>elev</i>[<b>+w</b><i>lon</i>/<i>lat</i>[/<i>z</i>]][<b>+v</b><i>x0</i>/<i>y0</i>]
] [ <b>−G</b><i>fill</i> ] [
<b>−H</b>[<b>i</b>][<i>nrec</i>] ] [
<b>−Jz</b>|<b>Z</b><i>parameters</i> ] [
<b>−I</b><i>fix_az</i> ] [ <b>−K</b> ] [
<b>−N</b> ] [ <b>−O</b> ] [ <b>−P</b> ] [
<b>−S</b>[<b>x</b>]<i>lon0</i>/<i>lat0</i>/<i>length</i>[/<i>units</i>]
] [ <b>−T</b><i>pen</i> ] [
<b>−U</b>[<i>just</i>/<i>dx</i>/<i>dy</i>/][<b>c</b>|<i>label</i>]
] [ <b>−V</b> ] [ <b>−W</b><i>pen</i> ] [
<b>−X</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>x-shift</i>[<b>u</b>]]
] [
<b>−Y</b>[<b>a</b>|<b>c</b>|<b>r</b>][<i>y-shift</i>[<b>u</b>]]
] [ <b>−c</b><i>copies</i> ] [
<b>−:</b>[<b>i</b>|<b>o</b>] ] [
<b>−bi</b>[<b>s</b>|<b>S</b>|<b>d</b>|<b>D</b>[<i>ncol</i>]|<b>c</b>[<i>var1</i><b>/</b><i>...</i>]]
] [ <b>−f</b><i>colinfo</i> ] [
<b>−m</b>[<b>i</b>|<b>o</b>][<i>flag</i>] ]</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>pswiggle</b>
reads (<i>x</i>,<i>y</i>,<i>z</i>) triplets from files [or
standard input] and plots z as a function of distance along
track. This means that two consecutive (<i>x</i>,<i>y</i>)
points define the local distance axis, and the local
<i>z</i> axis is then perpendicular to the distance axis.
The user may set a preferred positive anomaly plot
direction, and if the positive normal is outside the
plus/minus 90 degree window around the preferred direction,
then 180 degrees are added to the direction. Either the
positive or the negative wiggle may be shaded. The resulting
<i>PostScript</i> code is written to standard output.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><i>files</i></p></td>
<td width="4%"></td>
<td width="78%">
<p>List one or more file-names. If no files are given,
<b>pswiggle</b> will read standard input.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−J</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects the map projection. Scale is UNIT/degree,
1:xxxxx, or width in UNIT (upper case modifier). UNIT is cm,
inch, or m, depending on the <b><A HREF="gmtdefaults.html#MEASURE_UNIT">MEASURE_UNIT</A></b> setting in
.gmtdefaults4, but this can be overridden on the command
line by appending <b>c</b>, <b>i</b>, or <b>m</b> to the
scale/width value. When central meridian is optional,
default is center of longitude range on <b>−R</b>
option. Default standard parallel is the equator. For map
height, max dimension, or min dimension, append <b>h</b>,
<b>+</b>, or <b>-</b> to the width, respectively.</p></td></tr>
</table>
<p style="margin-left:22%;">More details can be found in
the <b><A HREF="psbasemap.html">psbasemap</A></b> man pages.</p>
<p style="margin-left:22%; margin-top: 1em"><b>CYLINDRICAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jc</b><i>lon0/lat0/scale</i>
(Cassini) <b><br>
−Jcyl_stere</b>/[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Stereographic) <b><br>
−Jj</b>[<i>lon0/</i>]<i>scale</i> (Miller) <b><br>
−Jm</b>[<i>lon0</i>/[<i>lat0/</i>]]<i>scale</i>
(Mercator) <b><br>
−Jm</b><i>lon0/lat0/scale</i> (Mercator - Give
meridian and standard parallel) <b><br>
−Jo</b>[<b>a</b>]<i>lon0/lat0/azimuth/scale</i>
(Oblique Mercator - point and azimuth) <b><br>
−Jo</b>[<b>b</b>]<i>lon0/lat0/lon1/lat1/scale</i>
(Oblique Mercator - two points) <b><br>
−Joc</b><i>lon0/lat0/lonp/latp/scale</i> (Oblique
Mercator - point and pole) <b><br>
−Jq</b>[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Equidistant) <b><br>
−Jt</b><i>lon0/</i>[<i>lat0/</i>]<i>scale</i> (TM -
Transverse Mercator) <b><br>
−Ju</b><i>zone/scale</i> (UTM - Universal Transverse
Mercator) <b><br>
−Jy</b>[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
(Cylindrical Equal-Area)</p>
<p style="margin-left:22%; margin-top: 1em"><b>CONIC
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jb</b><i>lon0/lat0/lat1/lat2/scale</i>
(Albers) <b><br>
−Jd</b><i>lon0/lat0/lat1/lat2/scale</i> (Conic
Equidistant) <b><br>
−Jl</b><i>lon0/lat0/lat1/lat2/scale</i> (Lambert Conic
Conformal) <b><br>
−Jpoly</b>/[<i>lon0/</i>[<i>lat0/</i>]]<i>scale</i>
((American) Polyconic)</p>
<p style="margin-left:22%; margin-top: 1em"><b>AZIMUTHAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Ja</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Lambert Azimuthal Equal-Area) <b><br>
−Je</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Azimuthal Equidistant) <b><br>
−Jf</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Gnomonic) <b><br>
−Jg</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(Orthographic) <b><br>
−Jg</b><i>lon0/lat0/altitude/azimuth/tilt/twist/Width/Height/scale</i>
(General Perspective). <b><br>
−Js</b><i>lon0/lat0</i>[<i>/horizon</i>]<i>/scale</i>
(General Stereographic)</p>
<p style="margin-left:22%; margin-top: 1em"><b>MISCELLANEOUS
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jh</b>[<i>lon0/</i>]<i>scale</i>
(Hammer) <b><br>
−Ji</b>[<i>lon0/</i>]<i>scale</i> (Sinusoidal) <b><br>
−Jkf</b>[<i>lon0/</i>]<i>scale</i> (Eckert IV) <b><br>
−Jk</b>[<b>s</b>][<i>lon0/</i>]<i>scale</i> (Eckert
VI) <b><br>
−Jn</b>[<i>lon0/</i>]<i>scale</i> (Robinson) <b><br>
−Jr</b>[<i>lon0/</i>]<i>scale</i> (Winkel Tripel)
<b><br>
−Jv</b>[<i>lon0/</i>]<i>scale</i> (Van der Grinten)
<b><br>
−Jw</b>[<i>lon0/</i>]<i>scale</i> (Mollweide)</p>
<p style="margin-left:22%; margin-top: 1em"><b>NON-GEOGRAPHICAL
PROJECTIONS:</b></p>
<p style="margin-left:22%; margin-top: 1em"><b>−Jp</b>[<b>a</b>]<i>scale</i>[<i>/origin</i>][<b>r</b>|<b>z</b>]
(Polar coordinates (theta,r)) <b><br>
−Jx</b><i>x-scale</i>[<b>d</b>|<b>l</b>|<b>p</b><i>pow</i>|<b>t</b>|<b>T</b>][<i>/y-scale</i>[<b>d</b>|<b>l</b>|<b>p</b><i>pow</i>|<b>t</b>|<b>T</b>]]
(Linear, log, and power scaling)</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p style="margin-top: 1em"><b>−R</b></p></td>
<td width="8%"></td>
<td width="78%">
<p style="margin-top: 1em"><i>xmin</i>, <i>xmax</i>,
<i>ymin</i>, and <i>ymax</i> specify the Region of interest.
For geographic regions, these limits correspond to <i>west,
east, south,</i> and <i>north</i> and you may specify them
in decimal degrees or in [+-]dd:mm[:ss.xxx][W|E|S|N] format.
Append <b>r</b> if lower left and upper right map
coordinates are given instead of w/e/s/n. The two shorthands
<b>−Rg</b> and <b>−Rd</b> stand for global
domain (0/360 and -180/+180 in longitude respectively, with
-90/+90 in latitude). Alternatively, specify the name of an
existing grid file and the <b>−R</b> settings (and
grid spacing, if applicable) are copied from the grid. For
calendar time coordinates you may either give (a) relative
time (relative to the selected <b><A HREF="gmtdefaults.html#TIME_EPOCH">TIME_EPOCH</A></b> and in the
selected <b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b>; append <b>t</b> to
<b>−JX</b>|<b>x</b>), or (b) absolute time of the form
[<i>date</i>]<b>T</b>[<i>clock</i>] (append <b>T</b> to
<b>−JX</b>|<b>x</b>). At least one of <i>date</i> and
<i>clock</i> must be present; the <b>T</b> is always
required. The <i>date</i> string must be of the form
[-]yyyy[-mm[-dd]] (Gregorian calendar) or yyyy[-Www[-d]]
(ISO week calendar), while the <i>clock</i> string must be
of the form hh:mm:ss[.xxx]. The use of delimiters and their
type and positions must be exactly as indicated (however,
input, output and plot formats are customizable; see
<b><A HREF="gmtdefaults.html">gmtdefaults</A></b>).</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="3%">
<p><b>−Z</b></p></td>
<td width="8%"></td>
<td width="78%">
<p>Gives anomaly scale in data-units/distance-unit.</p></td></tr>
</table>
<h2>OPTIONS
<a name="OPTIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">No space
between the option flag and the associated arguments.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><b>−A</b></p></td>
<td width="4%"></td>
<td width="78%">
<p style="margin-top: 1em">Sets the preferred positive
azimuth. Positive wiggles will "gravitate" towards
that direction.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−B</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets map boundary annotation and tickmark intervals; see
the <b><A HREF="psbasemap.html">psbasemap</A></b> man page for all the details.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−C</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Subtract <i>center</i> from the data set before plotting
[0].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−D</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Means there is a data gap if 2 consecutive points are
more than <i>gap</i> distance units apart. For geographic
map projections the <i>gap</i> is assumed to be in km, else
it is in the user’s units.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−E</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Sets the viewpoint’s azimuth and elevation (for
perspective view) [180/90]. For frames used for animation,
you may want to append <b>+</b> to fix the center of your
data domain (or specify a particular world coordinate point
with <b>+w</b><i>lon0</i>/<i>lat</i>[/<i>z</i>]) which will
project to the center of your page size (or specify the
coordinates of the projected view point with
<b>+v</b><i>x0</i>/<i>y0).</i></p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−G</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Set fill shade, color or pattern of positive wiggles
[Default is black] (See SPECIFYING FILL below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−H</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Input file(s) has header record(s). If used, the default
number of header records is <b><A HREF="gmtdefaults.html#N_HEADER_RECS">N_HEADER_RECS</A></b>. Use
<b>−Hi</b> if only input data should have header
records [Default will write out header records if the input
data have them]. Blank lines and lines starting with # are
always skipped.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−I</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Set a fixed azimuth projection for wiggles [Default uses
track azimuth, but see <b>−A</b>].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−K</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>More <i>PostScript</i> code will be appended later
[Default terminates the plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−N</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Paint negative wiggles instead of positive
[Default].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−O</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Overlay plot mode [Default initializes a new
plot system].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−P</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects Portrait plotting mode [Default is Landscape,
see <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> to change this].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−S</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draws a simple vertical scale centered on
<i>lon0/lat0</i>. Use <b>−Sx</b> to specify cartesian
coordinates instead. <i>length</i> is in z units, append
unit name for labeling</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−T</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw track [Default is no track]. Append pen attributes
to use [Defaults: width = 0.25p, color = black, texture =
solid]. (See SPECIFYING PENS below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−U</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw Unix System time stamp on plot. By adding
<i>just/dx/dy/</i>, the user may specify the justification
of the stamp and where the stamp should fall on the page
relative to lower left corner of the plot. For example,
BL/0/0 will align the lower left corner of the time stamp
with the lower left corner of the plot. Optionally, append a
<i>label</i>, or <b>c</b> (which will plot the command
string.). The <b><A HREF="GMT.html">GMT</A></b> parameters <b><A HREF="gmtdefaults.html#UNIX_TIME">UNIX_TIME</A></b>,
<b><A HREF="gmtdefaults.html#UNIX_TIME_POS">UNIX_TIME_POS</A></b>, and <b><A HREF="gmtdefaults.html#UNIX_TIME_FORMAT">UNIX_TIME_FORMAT</A></b> can affect
the appearance; see the <b><A HREF="gmtdefaults.html">gmtdefaults</A></b> man page for
details. The time string will be in the locale set by the
environment variable <b>TZ</b> (generally local time).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−V</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects verbose mode, which will send progress reports
to stderr [Default runs "silently"].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−W</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Draw wiggle outline [Default is no outline]. Append pen
attributes to use [Defaults: width = 0.25p, color = black,
texture = solid]. (See SPECIFYING PENS below).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−X −Y</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Shift plot origin relative to the current origin by
(<i>x-shift,y-shift</i>) and optionally append the length
unit (<b>c</b>, <b>i</b>, <b>m</b>, <b>p</b>). You can
prepend <b>a</b> to shift the origin back to the original
position after plotting, or prepend <b>r</b> [Default] to
reset the current origin to the new location. If
<b>−O</b> is used then the default
(<i>x-shift,y-shift</i>) is (0,0), otherwise it is (r1i,
r1i) or (r2.5c, r2.5c). Alternatively, give <b>c</b> to
align the center coordinate (x or y) of the plot with the
center of the page based on current page size.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−:</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Toggles between (longitude,latitude) and
(latitude,longitude) input and/or output. [Default is
(longitude,latitude)]. Append <b>i</b> to select input only
or <b>o</b> to select output only. [Default affects
both].</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−bi</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Selects binary input. Append <b>s</b> for single
precision [Default is <b>d</b> (double)]. Uppercase <b>S</b>
or <b>D</b> will force byte-swapping. Optionally, append
<i>ncol</i>, the number of columns in your binary input file
if it exceeds the columns needed by the program. Or append
<b>c</b> if the input file is netCDF. Optionally, append
<i>var1</i><b>/</b><i>var2</i><b>/</b><i>...</i> to specify
the variables to be read. [Default is 3 input columns].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−c</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Specifies the number of plot copies. [Default is 1].</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−f</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Special formatting of input and/or output columns (time
or geographical data). Specify <b>i</b> or <b>o</b> to make
this apply only to input or output [Default applies to
both]. Give one or more columns (or column ranges) separated
by commas. Append <b>T</b> (absolute calendar time),
<b>t</b> (relative time in chosen <b><A HREF="gmtdefaults.html#TIME_UNIT">TIME_UNIT</A></b> since
<b><A HREF="gmtdefaults.html#TIME_EPOCH">TIME_EPOCH</A></b>), <b>x</b> (longitude), <b>y</b>
(latitude), or <b>f</b> (floating point) to each column or
column range item. Shorthand
<b>−f</b>[<b>i</b>|<b>o</b>]<b>g</b> means
<b>−f</b>[<b>i</b>|<b>o</b>]0<b>x</b>,1<b>y</b>
(geographic coordinates).</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>−m</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>Multiple segment file(s). Segments are separated by a
special record. For ASCII files the first character must be
<i>flag</i> [Default is ’>’]. For binary
files all fields must be NaN and <b>−b</b> must set
the number of output columns explicitly. By default the
<b>−m</b> setting applies to both input and output.
Use <b>−mi</b> and <b>−mo</b> to give separate
settings to input and output.</p></td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em"><b>SPECIFYING
PENS</b></p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="4%">
<p style="margin-top: 1em"><i>pen</i></p></td>
<td width="7%"></td>
<td width="78%">
<p style="margin-top: 1em">The attributes of lines and
symbol outlines as defined by <i>pen</i> is a comma
delimetered list of <i>width</i>, <i>color</i> and
<i>texture</i>, each of which is optional. <i>width</i> can
be indicated as a measure (points, centimeters, inches) or
as <b>faint</b>, <b>thin</b>[<b>ner</b>|<b>nest</b>],
<b>thick</b>[<b>er</b>|<b>est</b>],
<b>fat</b>[<b>ter</b>|<b>test</b>], or <b>obese</b>.
<i>color</i> specifies a gray shade or color (see SPECIFYING
COLOR below). <i>texture</i> is a combination of dashes
‘-’ and dots ‘.’.</p></td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em"><b>SPECIFYING
FILL</b></p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="6%">
<p style="margin-top: 1em"><i>fill</i></p></td>
<td width="5%"></td>
<td width="78%">
<p style="margin-top: 1em">The attribute <i>fill</i>
specifies the solid shade or solid <i>color</i> (see
SPECIFYING COLOR below) or the pattern used for filling
polygons. Patterns are specified as
<b>p</b><i>dpi/pattern</i>, where <i>pattern</i> gives the
number of the built-in pattern (1-90) <i>or</i> the name of
a Sun 1-, 8-, or 24-bit raster file. The <i>dpi</i> sets the
resolution of the image. For 1-bit rasters: use
<b>P</b><i>dpi/pattern</i> for inverse video, or append
<b>:F</b><i>color</i>[<b>B</b>[<i>color</i>]] to specify
fore- and background colors (use <i>color</i> = - for
transparency). See <b><A HREF="GMT.html">GMT</A></b> Cookbook & Technical
Reference Appendix E for information on individual
patterns.</p> </td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em"><b>SPECIFYING
COLOR</b></p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><i>color</i></p></td>
<td width="4%"></td>
<td width="78%">
<p style="margin-top: 1em">The <i>color</i> of lines, areas
and patterns can be specified by a valid color name; by a
gray shade (in the range 0−255); by a decimal color
code (r/g/b, each in range 0−255; h-s-v, ranges
0−360, 0−1, 0−1; or c/m/y/k, each in range
0−1); or by a hexadecimal color code (#rrggbb, as used
in HTML). See the <b><A HREF="gmtcolors.html">gmtcolors</A></b> manpage for more
information and a full list of color names.</p></td></tr>
</table>
<h2>EXAMPLES
<a name="EXAMPLES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">To plot the
magnetic anomaly stored in the file track.xym along track @
1000 nTesla/cm (after removing a mean value of 32000
nTesla), using a 15 -cm-wide Polar Stereographic map ticked
every 5 degrees in Portrait mode, with positive anomalies in
red on a blue track of width 0.25 points, use</p>
<p style="margin-left:11%; margin-top: 1em"><b>pswiggle</b>
track.xym <b>−R</b>-20/10/-80/-60 <b>−JS</b>
0/90/15<b>c −Z</b> 1000 <b>−B</b> 5
<b>−C</b> 32000 <b>−P −G</b> red
<b>−T</b> 0.25<b>p</b>,blue <b>−S</b> 1000
<b>−V</b> > track_xym.ps</p>
<h2>BUGS
<a name="BUGS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Sometimes the
(x,y) coordinates are not printed with enough significant
digits, so the local perpendicular to the track swings
around a lot. To see if this is the problem, you should do
this:</p>
<p style="margin-left:11%; margin-top: 1em">awk ’{ if
(NR > 1) print atan2(y-$1, x-$2); y=$1; x=$2; }’
yourdata.xyz | more</p>
<p style="margin-left:11%; margin-top: 1em">(note that
output is in radians; on some machines you need
"nawk" to do this). Then if these numbers jump
around a lot, you may do this:</p>
<p style="margin-left:11%; margin-top: 1em">awk ’{
print NR, $0 }’ yourdata.xyz | <b>filter1d
−Fb</b> 5 <b>−N</b> 4/0
<b>−−D_FORMAT</b>=<i>value</i> >
smoothed.xyz</p>
<p style="margin-left:11%; margin-top: 1em">and plot this
data set instead.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><i><A HREF="GMT.html">GMT</A></i>(1),
<i><A HREF="gmtcolors.html">gmtcolors</A></i>(5), <i><A HREF="filter1d.html">filter1d</A></i>(1),
<i><A HREF="psbasemap.html">psbasemap</A></i>(1), <i><A HREF="splitxyz.html">splitxyz</A></i>(1)</p>
<hr>
</body>
</html>
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