/usr/lib/pd/extra/pdp/pdp_chrot-help.pd is in pd-pdp 1:0.14.1-3+b1.
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 | #N canvas 355 66 554 208 10;
#X obj 74 64 pdp_help_input;
#X msg 74 31 start;
#X msg 124 31 stop;
#X obj 74 121 pdp_chrot;
#X obj 74 157 pdp_help_output;
#X floatatom 151 99 5 0 0;
#X text 204 100 rotate the chroma components by this angle;
#X connect 0 0 3 0;
#X connect 1 0 0 0;
#X connect 2 0 0 0;
#X connect 3 0 4 0;
#X connect 5 0 3 1;
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