/usr/lib/pd/extra/cxc/delta~-help.pd is in pd-cxc 0.5.2-1.
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 80 44 noise~;
#X obj 83 268 print a;
#X obj 143 267 print b;
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#X msg 220 340 bang;
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#X obj 139 468 table test;
#X msg 139 442 resize 2205;
#X obj 242 389 tabwrite~ test;
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#X text 308 36 if this sample is larger than last \, value is positive
\, else negative ...;
#X text 308 18 delta~: difference between this and last sample;
#N canvas 397 200 494 344 META 0;
#X text 12 145 HELP_PATCH_AUTHORS Jonathan Wilkes revised the patch
to conform to the PDDP template for Pd version 0.42.;
#X text 12 5 KEYWORDS signal;
#X text 12 105 LIBRARY external cxc;
#X text 12 45 DESCRIPTION difference between this and last sample;
#X text 12 65 INLET_0 signal;
#X text 12 85 OUTLET_0 signal;
#X text 12 25 LICENSE GPL v2;
#X text 12 125 AUTHOR jdl@xdv.org;
#X restore 935 557 pd META;
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