/usr/lib/pd/extra/mapping/elliptic-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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | #N canvas 249 248 567 425 12;
#X obj 418 32 import mapping ggee;
#X obj 5 2 cnv 15 550 20 empty empty elliptic 2 11 1 18 -233017 -66577
0;
#X msg 516 2 pddp;
#X text 313 393 released under the GNU GPL;
#X text 263 356 For more info:;
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#X floatatom 35 278 8 0 0 0 - - -;
#X obj 38 305 hsl 200 20 0 1 0 0 empty empty curved_output 22 11 1
12 -262144 -1 -1 0 1;
#X obj 38 101 hsl 200 20 0 1 0 0 empty empty raw_input 22 11 1 12 -261681
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#X obj 362 356 pddp/open mapping-about;
#X text 0 393 (C) Copyright 2007 Free Software Foundation;
#X obj 74 167 hsl 50 15 0 1 0 1 \$0-x-slider \$0-x-slider-receive x
5 9 0 11 -232576 -1 -1 1984 0;
#X floatatom 80 187 7 0 0 0 - - -;
#X text 6 33 This object curves the input range using two ellipses
that meet at the specified point.;
#X obj 35 247 elliptic;
#N canvas 273 69 478 411 draw_array 0;
#X msg 54 82 bang;
#X obj 54 133 until;
#X text 85 82 start;
#X obj 54 155 f;
#X obj 83 155 + 1;
#X obj 54 43 loadbang;
#X obj 54 210 trigger float float;
#X obj 127 157 select 0;
#X obj 66 343 tabwrite \$0-curve;
#X obj 139 53 trigger bang float;
#X obj 83 177 mod 200;
#X obj 54 254 / 200;
#X text 96 254 mapping output range: 0 to 1;
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#X obj 253 33 receive \$0-y;
#X obj 253 57 moses;
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#X obj 331 99 bang;
#X msg 331 120 200;
#X obj 238 98 bang;
#X msg 238 119 0;
#X obj 91 56 moses;
#X obj 118 77 moses 201;
#X obj 169 98 bang;
#X msg 169 119 200;
#X obj 76 97 bang;
#X msg 76 118 0;
#X obj 91 32 receive \$0-x;
#X obj 117 289 receive \$0-x-slider;
#X floatatom 118 312 5 0 0 0 - - -;
#X floatatom 279 313 5 0 0 0 - - -;
#X obj 280 290 receive \$0-y-slider;
#X obj 118 169 / 200;
#X obj 280 170 / 200;
#X obj 118 249 send \$0-x-slider-receive;
#X obj 280 250 send \$0-y-slider-receive;
#X msg 281 193 1 \$1;
#X obj 280 221 -;
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#X connect 18 0 20 0;
#X connect 19 0 22 0;
#X connect 22 0 23 0;
#X connect 23 0 21 0;
#X restore 265 348 pd receive from gcanvas;
#X obj 138 9 receive \$0-x-slider;
#X obj 293 12 receive \$0-y-slider;
#X obj 294 50 trigger bang float;
#X obj 54 108 cyclone/speedlim 100;
#X obj 54 280 elliptic;
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#X restore 409 71 pd draw_array;
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#X coords 0 1 199 0 200 200 1;
#X restore 304 103 graph;
#X obj 304 308 send \$0-x;
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