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<h1 id="sec123" class="chapter">Appendix&#XA0;B&#XA0;&#XA0;Parameter Definitions </h1>
<pre class="verbatim">anynul   - set to TRUE (=1) if any returned values are undefined, else FALSE
array    - array of numerical data values to read or write
ascii    - encoded checksum string
binspec  - the input table binning specifier
bitpix   - bits per pixel. The following symbolic mnemonics are predefined:
               BYTE_IMG   =   8 (unsigned char)
               SHORT_IMG  =  16 (signed short integer)
               LONG_IMG   =  32 (signed long integer)
               LONGLONG_IMG =  64 (signed long 64-bit integer)
               FLOAT_IMG  = -32 (float)
               DOUBLE_IMG = -64 (double).
           The LONGLONG_IMG type is experimental and is not officially
           recognized in the FITS Standard document.
           Two additional values, USHORT_IMG and ULONG_IMG are also available
           for creating unsigned integer images.  These are equivalent to
           creating a signed integer image with BZERO offset keyword values
           of 32768 or 2147483648, respectively, which is the convention that
           FITS uses to store unsigned integers.
card     - header record to be read or written (80 char max, null-terminated)
casesen  - CASESEN (=1) for case-sensitive string matching, else CASEINSEN (=0)
cmopt    - grouping table "compact" option parameter. Allowed values are:
           OPT_CMT_MBR and OPT_CMT_MBR_DEL.
colname  - name of the column (null-terminated)
colnum   - column number (first column = 1)
colspec  - the input file column specification; used to delete, create, or rename
           table columns
comment  - the keyword comment field (72 char max, null-terminated)
complm   - should the checksum be complemented?
comptype - compression algorithm to use: GZIP_1, RICE_1, HCOMPRESS_1, or PLIO_1
coordtype- type of coordinate projection (-SIN, -TAN, -ARC, -NCP,
           -GLS, -MER, or -AIT)
cpopt    - grouping table copy option parameter. Allowed values are:
           OPT_GCP_GPT, OPT_GCP_MBR, OPT_GCP_ALL, OPT_MCP_ADD, OPT_MCP_NADD,
           OPT_MCP_REPL, amd OPT_MCP_MOV.
create_col- If TRUE, then insert a new column in the table, otherwise
           overwrite the existing column.
current  - if TRUE, then the current HDU will be copied
dataok   - was the data unit verification successful (=1) or
           not (= -1).  Equals zero if the DATASUM keyword is not present.
datasum  - 32-bit 1's complement checksum for the data unit
dataend  - address (in bytes) of the end of the HDU
datastart- address (in bytes) of the start of the data unit
datatype - specifies the data type of the value.  Allowed value are:  TSTRING,
           TLOGICAL, TBYTE, TSBYTE, TSHORT, TUSHORT, TINT, TUINT, TLONG, TULONG,
           TFLOAT, TDOUBLE, TCOMPLEX, and TDBLCOMPLEX
datestr  - FITS date/time string: 'YYYY-MM-DDThh:mm:ss.ddd', 'YYYY-MM-dd',
           or 'dd/mm/yy'
day      - calendar day (UTC) (1-31)
decimals - number of decimal places to be displayed
deltasize - increment for allocating more memory
dim1     - declared size of the first dimension of the image or cube array
dim2     - declared size of the second dimension of the data cube array
dispwidth - display width of a column = length of string that will be read
dtype    - data type of the keyword ('C', 'L', 'I', 'F' or 'X')
                C = character string
                L = logical
                I = integer
                F = floating point number
                X = complex, e.g., "(1.23, -4.56)"
err_msg  - error message on the internal stack (80 chars max)
err_text - error message string corresponding to error number (30 chars max)
exact    - TRUE (=1) if the strings match exactly;
           FALSE (=0) if wildcards are used
exclist  - array of pointers to keyword names to be excluded from search
exists   - flag indicating whether the file or compressed file exists on disk
expr     - boolean or arithmetic expression
extend   - TRUE (=1) if FITS file may have extensions, else FALSE (=0)
extname  - value of the EXTNAME keyword (null-terminated)
extspec  - the extension or HDU specifier; a number or name, version, and type
extver   - value of the EXTVER keyword = integer version number
filename - full name of the FITS file, including optional HDU and filtering specs
filetype - type of file (file://, ftp://, http://, etc.)
filter   - the input file filtering specifier
firstchar- starting byte in the row (first byte of row = 1)
firstfailed - member HDU ID (if positive) or grouping table GRPIDn index
           value (if negative) that failed grouping table verification.
firstelem- first element in a vector (ignored for ASCII tables)
firstrow - starting row number (first row of table = 1)
following- if TRUE, any HDUs following the current HDU will be copied
fpixel   - coordinate of the first pixel to be read or written in the
           FITS array.  The array must be of length NAXIS and have values such
           that fpixel[0] is in the range 1 to NAXIS1, fpixel[1] is in the
           range 1 to NAXIS2, etc.
fptr     - pointer to a 'fitsfile' structure describing the FITS file.
frac     - factional part of the keyword value
gcount   - number of groups in the primary array (usually = 1)
gfptr    - fitsfile* pointer to a grouping table HDU.
group    - GRPIDn/GRPLCn index value identifying a grouping table HDU, or
           data group number (=0 for non-grouped data)
grouptype - Grouping table parameter that specifies the columns to be
           created in a grouping table HDU. Allowed values are: GT_ID_ALL_URI,
           GT_ID_REF, GT_ID_POS, GT_ID_ALL, GT_ID_REF_URI, and GT_ID_POS_URI.
grpname  - value to use for the GRPNAME keyword value.
hdunum   - sequence number of the HDU (Primary array = 1)
hduok    - was the HDU verification successful (=1) or
           not (= -1).  Equals zero if the CHECKSUM keyword is not present.
hdusum   - 32 bit 1's complement checksum for the entire CHDU
hdutype  - HDU type: IMAGE_HDU (0), ASCII_TBL (1), BINARY_TBL (2), ANY_HDU (-1)
header   - returned character string containing all the keyword records
headstart- starting address (in bytes) of the CHDU
heapsize - size of the binary table heap, in bytes
history  - the HISTORY keyword comment string (70 char max, null-terminated)
hour     - hour within day (UTC) (0 - 23)
inc      - sampling interval for pixels in each FITS dimension
inclist  - array of pointers to matching keyword names
incolnum - input column number; range = 1 to TFIELDS
infile   - the input filename, including path if specified
infptr   - pointer to a 'fitsfile' structure describing the input FITS file.
intval   - integer part of the keyword value
iomode   - file access mode: either READONLY (=0) or READWRITE (=1)
keyname  - name of a keyword (8 char max, null-terminated)
keynum   - position of keyword in header (1st keyword = 1)
keyroot  - root string for the keyword name (5 char max, null-terminated)
keysexist- number of existing keyword records in the CHU
keytype  - header record type: -1=delete;  0=append or replace;
                   1=append; 2=this is the END keyword
longstr  - arbitrarily long string keyword value (null-terminated)
lpixel   - coordinate of the last pixel to be read or written in the
           FITS array.  The array must be of length NAXIS and have values such
           that lpixel[0] is in the range 1 to NAXIS1, lpixel[1] is in the
           range 1 to NAXIS2, etc.
match    - TRUE (=1) if the 2 strings match, else FALSE (=0)
maxdim   - maximum number of values to return
member   - row number of a grouping table member HDU.
memptr   - pointer to the a FITS file in memory
mem_realloc - pointer to a function for reallocating more memory
memsize  - size of the memory block allocated for the FITS file
mfptr    - fitsfile* pointer to a grouping table member HDU.
mgopt    - grouping table merge option parameter. Allowed values are:
           OPT_MRG_COPY, and OPT_MRG_MOV.
minute   - minute within hour (UTC) (0 - 59)
month    - calendar month (UTC) (1 - 12)
morekeys - space in the header for this many more keywords
n_good_rows - number of rows evaluating to TRUE
namelist - string containing a comma or space delimited list of names
naxes    - size of each dimension in the FITS array
naxis    - number of dimensions in the FITS array
naxis1   - length of the X/first axis of the FITS array
naxis2   - length of the Y/second axis of the FITS array
naxis3   - length of the Z/third axis of the FITS array
nbytes   - number of bytes or characters to read or write
nchars   - number of characters to read or write
nelements- number of data elements to read or write
newfptr  - returned pointer to the reopened file
newveclen- new value for the column vector repeat parameter
nexc     - number of names in the exclusion list (may = 0)
nfound   - number of keywords found (highest keyword number)
nkeys    - number of keywords in the sequence
ninc     - number of names in the inclusion list
nmembers - Number of grouping table members (NAXIS2 value).
nmove    - number of HDUs to move (+ or -), relative to current position
nocomments - if equal to TRUE, then no commentary keywords will be copied
noisebits- number of bits to ignore when compressing floating point images
nrows    - number of rows in the table
nstart   - first integer value
nullarray- set to TRUE (=1) if corresponding data element is undefined
nulval   - numerical value to represent undefined pixels
nulstr   - character string used to represent undefined values in ASCII table
numval   - numerical data value, of the appropriate data type
offset   - byte offset in the heap or data unit to the first element of the vector
openfptr - pointer to a currently open FITS file
overlap  - number of bytes in the binary table heap pointed to by more than 1
           descriptor
outcolnum- output column number; range = 1 to TFIELDS + 1
outfile  - and optional output filename; the input file will be copied to this prior
           to opening the file
outfptr  - pointer to a 'fitsfile' structure describing the output FITS file.
pcount   - value of the PCOUNT keyword = size of binary table heap
previous - if TRUE, any previous HDUs in the input file will be copied.
repeat   - length of column vector (e.g. 12J); == 1 for ASCII table
rmopt    - grouping table remove option parameter. Allowed values are:
           OPT_RM_GPT, OPT_RM_ENTRY, OPT_RM_MBR, and OPT_RM_ALL.
rootname - root filename, minus any extension or filtering specifications
rot      - celestial coordinate rotation angle (degrees)
rowlen   - length of a table row, in characters or bytes
rowlist  - sorted list of row numbers to be deleted from the table
rownum   - number of the row (first row = 1)
rowrange - list of rows or row ranges: '3,6-8,12,56-80' or '500-'
row_status - array of True/False results for each row that was evaluated
scale    - linear scaling factor; true value = (FITS value) * scale + zero
second   - second within minute (0 - 60.9999999999) (leap second!)
section  - section of image to be copied (e.g. 21:80,101:200)
simple   - TRUE (=1) if FITS file conforms to the Standard, else FALSE (=0)
space    - number of blank spaces to leave between ASCII table columns
status   - returned error status code (0 = OK)
sum      - 32 bit unsigned checksum value
tbcol    - byte position in row to start of column (1st col has tbcol = 1)
tdisp    - Fortran style display format for the table column
tdimstr  - the value of the TDIMn keyword
templt   - template string used in comparison (null-terminated)
tfields  - number of fields (columns) in the table
tfopt    - grouping table member transfer option parameter. Allowed values are:
           OPT_MCP_ADD, and OPT_MCP_MOV.
tform    - format of the column (null-terminated); allowed values are:
           ASCII tables:  Iw, Aw, Fww.dd, Eww.dd, or Dww.dd
           Binary tables: rL, rX, rB, rI, rJ, rA, rAw, rE, rD, rC, rM
           where 'w'=width of the field, 'd'=no. of decimals, 'r'=repeat count.
           Variable length array columns are denoted by a '1P' before the data type
           character (e.g., '1PJ').  When creating a binary table, 2 addition tform
           data type codes are recognized by CFITSIO: 'rU' and 'rV' for unsigned
           16-bit and unsigned 32-bit integer, respectively.

theap    - zero indexed byte offset of starting address of the heap
           relative to the beginning of the binary table data
tilesize - array of length NAXIS that specifies the dimensions of
           the image compression tiles
ttype    - label or name for table column (null-terminated)
tunit    - physical unit for table column (null-terminated)
typechar - symbolic code of the table column data type
typecode - data type code of the table column.  The negative of
           the value indicates a variable length array column.
                Datatype             typecode    Mnemonic
                bit, X                   1        TBIT
                byte, B                 11        TBYTE
                logical, L              14        TLOGICAL
                ASCII character, A      16        TSTRING
                short integer, I        21        TSHORT
                integer, J              41        TINT32BIT (same as TLONG)
                long long integer, K    81        TLONGLONG
                real, E                 42        TFLOAT
                double precision, D     82        TDOUBLE
                complex, C              83        TCOMPLEX
                double complex, M      163        TDBLCOMPLEX
unit     - the physical unit string (e.g., 'km/s') for a keyword
unused   - number of unused bytes in the binary table heap
urltype  - the file type of the FITS file (file://, ftp://, mem://, etc.)
validheap- returned value = FALSE if any of the variable length array
           address are outside the valid range of addresses in the heap
value    - the keyword value string (70 char max, null-terminated)
version  - current version number of the CFITSIO library
width    - width of the character string field
xcol     - number of the column containing the X coordinate values
xinc     - X axis coordinate increment at reference pixel (deg)
xpix     - X axis pixel location
xpos     - X axis celestial coordinate (usually RA) (deg)
xrefpix  - X axis reference pixel array location
xrefval  - X axis coordinate value at the reference pixel (deg)
ycol     - number of the column containing the X coordinate values
year     - calendar year (e.g. 1999, 2000, etc)
yinc     - Y axis coordinate increment at reference pixel (deg)
ypix     - y axis pixel location
ypos     - y axis celestial coordinate (usually DEC) (deg)
yrefpix  - Y axis reference pixel array location
yrefval  - Y axis coordinate value at the reference pixel (deg)
zero     - scaling offset; true value = (FITS value) * scale + zero
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