/usr/lib/pd/extra/zexy/coordinates-help.pd is in pd-zexy 2.2.7-2.
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 text 122 40 convert between SPHeric \, POLar and CARTesian coordinates
;
#X obj 99 305 cart2sph;
#X floatatom 150 286 5 0 0 0 z - -;
#X floatatom 124 268 5 0 0 0 y - -;
#X floatatom 99 248 5 0 0 0 x - -;
#X floatatom 150 366 5 0 0 0 theta - -;
#X floatatom 124 348 5 0 0 0 phi - -;
#X floatatom 99 328 5 0 0 0 r - -;
#X floatatom 150 116 5 0 0 0 z - -;
#X floatatom 124 98 5 0 0 0 y - -;
#X floatatom 99 78 5 0 0 0 x - -;
#X floatatom 150 196 5 0 0 0 z - -;
#X floatatom 124 178 5 0 0 0 phi - -;
#X floatatom 99 158 5 0 0 0 r - -;
#X obj 99 135 cart2pol;
#X floatatom 353 116 5 0 0 0 z - -;
#X floatatom 331 98 5 0 0 0 phi - -;
#X floatatom 309 78 5 0 0 0 r - -;
#X floatatom 353 196 5 0 0 0 theta - -;
#X floatatom 331 178 5 0 0 0 phi - -;
#X floatatom 309 158 5 0 0 0 r - -;
#X floatatom 360 286 5 0 0 0 z - -;
#X floatatom 334 268 5 0 0 0 phi - -;
#X floatatom 309 248 5 0 0 0 r - -;
#X floatatom 360 366 5 0 0 0 z - -;
#X floatatom 334 348 5 0 0 0 y - -;
#X floatatom 309 328 5 0 0 0 x - -;
#X floatatom 573 286 5 0 0 0 theta - -;
#X floatatom 551 268 5 0 0 0 phi - -;
#X floatatom 529 248 5 0 0 0 r - -;
#X floatatom 573 366 5 0 0 0 z - -;
#X floatatom 551 348 5 0 0 0 phi - -;
#X floatatom 529 328 5 0 0 0 r - -;
#X obj 529 305 sph2pol;
#X floatatom 580 116 5 0 0 0 theta - -;
#X floatatom 554 98 5 0 0 0 phi - -;
#X floatatom 529 78 5 0 0 0 r - -;
#X floatatom 580 196 5 0 0 0 z - -;
#X floatatom 554 178 5 0 0 0 y - -;
#X floatatom 529 158 5 0 0 0 x - -;
#X obj 529 135 sph2cart;
#X obj 309 135 pol2sph;
#X obj 309 305 pol2cart;
#X text 112 450 angles are given in RADian \, if you want DEGree you
might want to use [deg2rad] and [rad2deg];
#X text 599 17 part of zexy;
#N canvas 473 173 494 344 META 0;
#X text 12 235 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 45 LICENSE GPL v2;
#X text 12 25 KEYWORDS control abstraction conversion;
#X text 12 215 AUTHOR IOhannes m zmoelnig;
#X text 12 65 DESCRIPTION convert between spheric \, polar and cartesian
coordinates;
#X text 12 95 INLET_0 float;
#X text 12 115 INLET_1 float;
#X text 12 135 INLET_2 float;
#X text 12 155 OUTLET_0 float;
#X text 12 175 OUTLET_1 float;
#X text 12 196 OUTLET_2 float;
#X text 12 5 NAME cart2pol pol2sph sph2cart cart2sph pol2cart sph2pol
;
#X restore 664 487 pd META;
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