/usr/lib/pd/extra/mapping/curve-help.pd is in pd-mapping 0.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X obj 5 2 cnv 15 450 20 empty empty curve 2 11 1 18 -233017 -66577
0;
#X msg 422 3 pddp;
#X text 27 390 (C) Copyright 2004 Hans-Christoph Steiner <hans@at.or.at>
;
#X text 244 404 released under the GNU GPL;
#X text 158 361 For more info:;
#X floatatom 25 157 8 0 0 0 - - -;
#X floatatom 25 228 8 0 0 0 - - -;
#X obj 28 245 hsl 200 15 0 1 0 0 empty empty empty 22 8 1 12 -262144
-1 -1 0 1;
#X obj 28 137 hsl 200 15 0 1 0 0 empty empty empty 22 8 1 12 -261681
-1 -1 0 1;
#N canvas 0 22 450 300 graph1 0;
#X array \$0-curve 200 float 0;
#X coords 0 1 199 0 200 200 1;
#X restore 254 92 graph;
#N canvas 786 75 427 417 draw_array 0;
#X msg 54 82 bang;
#X obj 54 103 until;
#X text 85 82 start;
#X obj 54 125 f;
#X obj 83 125 + 1;
#X obj 54 43 loadbang;
#X obj 54 180 trigger float float;
#X obj 127 127 select 0;
#X obj 53 313 tabwrite \$0-curve;
#X obj 138 9 inlet;
#X obj 153 32 send \$0-to-numbox;
#X obj 139 53 trigger bang float;
#X obj 83 147 mod 200;
#X obj 54 257 / 200;
#X text 96 257 mapping output range: 0 to 1;
#X obj 53 283 mapping/curve;
#X connect 0 0 1 0;
#X connect 1 0 3 0;
#X connect 3 0 4 0;
#X connect 3 0 6 0;
#X connect 4 0 12 0;
#X connect 5 0 0 0;
#X connect 6 0 13 0;
#X connect 6 1 8 1;
#X connect 7 0 1 1;
#X connect 9 0 10 0;
#X connect 9 0 11 0;
#X connect 11 0 0 0;
#X connect 11 1 15 1;
#X connect 12 0 3 1;
#X connect 12 0 7 0;
#X connect 13 0 15 0;
#X connect 15 0 8 0;
#X restore 127 207 pd draw_array;
#X text 286 301 related objects:;
#X obj 342 320 curve_power;
#X obj 259 338 curve_exp;
#X obj 342 338 curve_log;
#X obj 117 166 hsl 128 15 -1 1 0 0 empty empty empty -2 -6 0 8 -262144
-1 -1 5300 0;
#X floatatom 192 184 7 0 0 0 - #0-to-numbox -;
#X obj 259 319 sinusoid;
#X obj 25 207 mapping/curve;
#X obj 262 359 pddp/open mapping-about;
#X text 17 39 This object generates a curve based on a -1 to 1 argument
range.;
#X connect 5 0 18 0;
#X connect 6 0 7 0;
#X connect 8 0 5 0;
#X connect 15 0 10 0;
#X connect 15 0 18 1;
#X connect 18 0 6 0;
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