/usr/share/puredata/doc/5.reference/rsqrt~-help.pd is in puredata-core 0.46.7-3.
This file is owned by root:root, with mode 0o644.
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#X obj 68 211 metro 500;
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#X text 419 349 updated for Pd version 0.33;
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#X obj 51 322 *;
#X obj 52 138 sig~;
#X obj 36 16 rsqrt~;
#X text 105 14 - signal reciprocal square root;
#X text 18 45 rsqrt~ takes the approximate reciprocal square root of
the incoming signal \, using a fast \, approximate algorithm which
is probably accurate to about 120 dB (20 bits).;
#X obj 52 162 rsqrt~;
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