/usr/lib/pd/extra/iemmatrix/mtx_.cabs2-help.pd is in pd-iemmatrix 0.2-1.
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 | #N canvas 88 457 841 379 10;
#X text 482 28 part of iemmatrix;
#X msg 33 172 matrix 1 2 1 2;
#X msg 49 193 matrix 1 2 0 1;
#X obj 33 124 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 33 148 t b b b b;
#X obj 33 216 t a a;
#X text 441 116 inletA: real part of matrix;
#X text 440 135 inletB: imaginary part of matrix;
#X text 439 157 outletA: real valued output;
#X obj 165 216 mtx_print realA;
#X obj 165 195 mtx_print imagA;
#X obj 33 280 mtx_print cabs2;
#X obj 33 242 mtx_.cabs2;
#X text 44 34 [mtx_.cabs2];
#X text 166 69 complex valued element wise matrix absolute value;
#X connect 1 0 5 0;
#X connect 2 0 12 1;
#X connect 2 0 10 0;
#X connect 3 0 4 0;
#X connect 4 0 1 0;
#X connect 4 1 2 0;
#X connect 5 0 12 0;
#X connect 5 1 9 0;
#X connect 12 0 11 0;
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