/usr/lib/pd/extra/rtc/sqrt-pan~.pd is in pd-rtclib 4.1-2.
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 | #N canvas 0 0 450 300 10;
#X obj 57 51 inlet~;
#X obj 126 96 expr sqrt(1-$f1) \; sqrt($f1);
#X obj 126 192 outlet~;
#X obj 57 192 outlet~;
#X obj 58 159 *~ 0.7;
#X obj 125 163 *~ 0.7;
#X obj 126 51 inlet;
#X connect 0 0 4 0;
#X connect 0 0 5 0;
#X connect 1 0 4 1;
#X connect 1 1 5 1;
#X connect 4 0 3 0;
#X connect 5 0 2 0;
#X connect 6 0 1 0;
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