/usr/lib/pd/extra/iemlib/hp4_cheb~-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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | #N canvas 280 180 381 450 10;
#X text 2 242 ~signal_in~;
#X text 27 30 dsp ON/OFF;
#X floatatom 93 168 3 15 133 0 - - -;
#X obj 93 187 mtof;
#X floatatom 93 206 9 0 22000 0 - - -;
#X text 157 207 Hz;
#X text 57 271 ~signal_out~;
#X floatatom 200 272 7 0 0 0 - - -;
#X text 251 273 dB;
#X floatatom 118 140 9 0 22000 0 - - -;
#X text 182 141 Hz;
#X floatatom 45 101 3 15 133 0 - - -;
#X floatatom 10 70 5 0 0 0 - - -;
#X text 50 71 % cpu;
#X floatatom 142 236 5 2 9999 0 - - -;
#X text 183 237 ms;
#X obj 10 50 dsp;
#X obj 10 30 tgl 15 0 empty empty empty 8 -8 0 10 -262144 -1 -1 0 1
;
#X obj 45 316 dac~;
#X obj 45 291 gainvu~ 300;
#X obj 256 150 vu 15 120 empty empty 8 -8 0 10 -66577 -1 1 0;
#X obj 320 160 vsl 15 128 0 127 0 1 empty empty empty 8 -8 0 10 -262144
-1 -1 8000 1;
#X obj 45 120 testtone~ 200;
#X obj 129 84 init 69;
#X text 72 102 midi;
#X text 59 340 1.arg:<float> cutoff_freq. [Hz];
#X text 59 350 2.arg:<float> interpolation_time [ms];
#X floatatom 286 308 7 0 0 0 - - -;
#X text 337 309 dB;
#X text 151 256 <- double-click;
#X obj 45 257 hp4_cheb~ 440 200;
#X text 78 397 IEM KUG;
#X text 62 385 musil;
#X text 92 385 @;
#X text 98 385 iem.at;
#X text 13 374 (c) Thomas Musil 2000 - 2005;
#X text 61 407 Graz \, Austria;
#X text 142 17 and +1 dB passband-ripple;
#X text 5 5 hp4_cheb~;
#X text 81 5 highpass 4.order with chebyshev characteristic;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 4 0 30 1;
#X connect 11 0 22 0;
#X connect 14 0 30 2;
#X connect 16 0 12 0;
#X connect 17 0 16 0;
#X connect 19 0 18 0;
#X connect 19 0 18 1;
#X connect 19 1 27 0;
#X connect 19 2 20 0;
#X connect 20 1 7 0;
#X connect 21 0 19 1;
#X connect 22 0 30 0;
#X connect 22 1 9 0;
#X connect 23 0 11 0;
#X connect 30 0 19 0;
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