/usr/lib/pd/extra/cyclone/atan2~-help.pd is in pd-cyclone 0.1~alpha55-3.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 | #N canvas 313 447 437 169 10;
#X declare -lib cyclone;
#X text 15 35 Standard C function for arctan(y/x);
#X obj 254 33 import cyclone;
#X obj 80 85 atan2~;
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