/usr/lib/pd/extra/iemlib/f2note-help.pd is in pd-iemlib 1.20.1-1.
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 16 17 18 19 20 21 22 23 24 25 26 27 28 | #N canvas 320 113 547 283 10;
#X floatatom 100 175 9 0 0 0 - - -;
#X floatatom 100 71 9 8 24000 0 - - -;
#X floatatom 166 125 6 0 0 0 - - -;
#X obj 100 101 f2note 440;
#X msg 132 148 #A;
#X text 8 52 <float> input frequency;
#X text 173 70 Hz;
#X text 215 124 cents;
#X text 67 147 note;
#X text 4 2 f2note;
#X text 233 241 IEM KUG;
#X text 209 229 musil;
#X text 247 229 @;
#X text 257 229 iem.at;
#X text 216 251 Graz \, Austria;
#X text 67 3 converts a frequency in Hz into a floatingpoint midi pitch
;
#X text 96 16 and a note plus its deviation in cents;
#X text 195 97 1.arg: <float> reference-frequency a' or A4;
#X text 344 112 (today 440 .. 444 Hz);
#X text 168 218 (c) Thomas Musil 2000 - 2011;
#X text 24 174 midi pitch;
#X text 35 122 deviation;
#X connect 1 0 3 0;
#X connect 3 0 0 0;
#X connect 3 1 4 0;
#X connect 3 2 2 0;
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