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/usr/share/texmf-texlive/mft/base/mplain.mft is in texlive-font-utils 2009-10ubuntu1.

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The actual contents of the file can be viewed below.

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%%%% MFT formatting commands for METAPOST macros defined in:
%%%%
%%%%     PLAIN.MP, MFPLAIN.MP, GRAPH.MP, BOXES.MP
%%%%
%%%% This file contains MFT formatting rules defined in `mp2.mft'
%%%% by Ulrik Vieth <vieth@thphy.uni-duesseldorf.de>.
%%%%
%%%% METAPOST primitives not found in METAFONT are hard-wired in
%%%% the MFT program.
%%%%
%%%% Variables and macros defined both in "plain.mf" and "plain.mp"
%%%% (from "plain.mft", but severly edited)
%%%%
%%% } ( ) ]] ! ^ %%%% tokens that need no special formatting
%%% .. ... -- --- %%%% path operators made of dots and dashes
%%% ++ ** %%%% binary operators made of two special characters
%%% step upto downto thru %%%% boldface binary operators
%%% addto fill unfill draw undraw %%%% boldface unary operators
%%% addto filldraw unfilldraw drawdot undrawdot cutdraw cutoff culldraw
%%% addto erase pickup penstroke
%%% addto exitunless stop incr decr
%%% pencircle pensquare penrazor penspeck
%%% true relax blankpicture %%%% boldface nullary operators
%%% true clearit shipit cullit openit showit clearxy clearpen savepen
%%% length abs dir byte %%%% unary operators to be in roman type
%%% length unitvector inverse ceiling round hround vround counterclockwise
%%% length tensepath reflectedabout rotatedaround rotatedabout
%%% length magstep max min
%%% and mod div dotprod
%%% and intersectionpoint softjoin %%%% binary operators to be roman
%%% penoffset direction directionpoint %%%% operators that take "of"
%%% penoffset takepower
%%% pausing pen_top pen_bot pen_lft pen_rt
%%% pausing lft rt top bot llft lrt ulft urt
%%% end bye
%%%%
%%%% Variables and macros defined only in "plain.mp"
%%%%
%%% addto beginfig %%%% boldface opening
%%% enddef endfig %%%% boldface closing
%%% addto dashpattern image bbox %%%% boldface operators
%%% addto label dotlabel thelabel %%%% FIXME: handling of suffixes?
%%% addto makelabel labels dotlabels penlabels
%%% addto arrowhead drawarrow drawdblarrow drawoptions
%%% length center on off %%%% unary operators in roman
%%% and cutbefore cutafter %%%% binary operators in roman
%%% pausing beveled butt mitered rounded squared evenly withdots
%%% pausing EOF
%%% for range
%%%%
%%%% Variables and macros defined only in "mfplain.mp"
%%%% (for METAFONT compatibility, partly from "plain.mft")
%%%%
%%% addto beginchar %%%% boldface opening
%%% enddef endchar %%%% boldface closing
%%% addto define_pixels define_whole_pixels define_whole_vertical_pixels
%%% addto define_good_x_pixels define_good_y_pixels define_blacker_pixels
%%% addto define_whole_blacker_pixels define_whole_vertical_blacker_pixels
%%% addto define_corrected_pixels define_horizontal_corrected_pixels
%%% addto lowres_fix screenrule proofrule proofoffset proofrulethickness
%%% addto makebox makegrid maketicks
%%% addto italcorr font_size font_slant
%%% addto font_normal_space font_normal_stretch font_normal_shrink font_quad
%%% addto font_x_height font_extra_space font_identifier font_coding_scheme
%%% def mode_def capsule_def
%%% true mode_setup
%%% true nodisplays notransforms screenchars screenstrokes
%%% true imagerules gfcorners
%%% pausing tolerance pixels_per_inch blacker o_correction %%%% internals
%%% pausing screen_rows screen_cols currentwindow displaying proofing
%%%%
%%%% Variables and macros defined in "graph.mp", "marith.mp", "sarith.mp"
%%%%
%%% addto begingraph %%%% boldface opening
%%% enddef endgraph %%%% boldface closing
%%% addto gdraw gfill gdata %%%% boldface operators
%%% addto glabel gdotlabel augment %%%% FIXME: handling of suffixes?
%%% addto gdrawarrow gdrawdblarrow gdrawoptions
%%% addto setcoords setrange
%%% good auto
%%% addto itick otick grid autogrid frame
%%% addto format
%%% length Mabs Sabs Scvnum Mlog_str %%%% unary operators in roman
%%% and Madd Msub Mmul Mdiv Mleq %%%% binary operators in roman
%%% and Sadd Ssub Smul Sdiv Sleq Sneq
%%% pausing linear log OUT %%%% internals
%%%%
%%%% Variables and macros defined in "boxes.mp" and "rboxes.mp"
%%%%
%%% addto drawboxes drawboxed drawunboxed boxjoin boxit circleit rboxit
%%% pausing defaultdx defaultdy