/usr/lib/pd/extra/zexy/sph2pol.pd is in pd-zexy 2.2.6-2.
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 259 331 outlet z;
#X obj 99 125 unpack 0 0 0;
#X obj 99 82 inlet r;
#X obj 179 82 inlet phi;
#X text 63 26 convert spherical to polar coordinates;
#X obj 259 82 inlet theta;
#X obj 82 331 outlet r;
#X obj 179 331 outlet phi;
#X text 295 156 phi=phi;
#X text 295 169 z=r*sin(theta);
#X text 294 141 R=r*cos(theta);
#X obj 106 265 pack 0 0 0;
#X obj 106 285 unpack 0 0 0;
#X obj 178 152 t f f;
#X obj 208 172 sin;
#X obj 178 172 cos;
#X obj 106 239 * 1;
#X obj 171 239 * 0;
#X obj 99 152 t f f;
#X obj 99 105 pack \$1 \$2 \$3;
#X text 344 10 part of zexy;
#X connect 1 0 18 0;
#X connect 1 1 11 1;
#X connect 1 2 13 0;
#X connect 2 0 19 0;
#X connect 3 0 19 1;
#X connect 5 0 19 2;
#X connect 11 0 12 0;
#X connect 12 0 6 0;
#X connect 12 1 7 0;
#X connect 12 2 0 0;
#X connect 13 0 15 0;
#X connect 13 1 14 0;
#X connect 14 0 17 1;
#X connect 15 0 16 1;
#X connect 16 0 11 0;
#X connect 17 0 11 2;
#X connect 18 0 16 0;
#X connect 18 1 17 0;
#X connect 19 0 1 0;
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