/usr/lib/pd/extra/mapping/fir.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 | #N canvas 495 51 462 394 10;
#X obj 324 9 import iemmatrix;
#X obj 158 59 inlet;
#X text 206 58 liste coef filtre;
#X text 72 34 flux donnees;
#X obj 85 57 inlet;
#X obj 85 207 mtx_.*;
#X obj 85 298 outlet;
#X obj 85 241 mtx_mean;
#X obj 158 178 list trim;
#X obj 85 155 list trim;
#X obj 158 155 list prepend matrix \$1 1;
#X obj 85 126 list prepend matrix \$1 1;
#X obj 85 269 * \$1;
#X obj 85 100 last_n \$1;
#X connect 1 0 10 0;
#X connect 4 0 13 0;
#X connect 5 0 7 0;
#X connect 7 0 12 0;
#X connect 8 0 5 1;
#X connect 9 0 5 0;
#X connect 10 0 8 0;
#X connect 11 0 9 0;
#X connect 12 0 6 0;
#X connect 13 0 11 0;
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