/usr/lib/pd/extra/iemlib/vcf_lp4~.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 | #N canvas 216 218 447 487 10;
#X obj 20 48 inlet~;
#X obj 20 358 outlet~;
#X text 69 47 ~signal_in~;
#X text 30 326 ~filtered signal_out~;
#X text 136 353 no arg.;
#X obj 64 76 inlet~;
#X obj 130 103 inlet~;
#X text 176 103 <signal> Q [-];
#X text 110 77 <signal> cutoff_frequency [Hz];
#X text 12 8 vcf_lp4~;
#X obj 20 270 vcf_filter~ lp2;
#X obj 20 307 vcf_filter~ lp2;
#X text 136 7 lowpass 4.order with signal-inlets;
#X text 168 19 for frequency and Q;
#X obj 63 216 iem_cot4~;
#X obj 130 132 iem_sqrt4~;
#X text 166 415 IEM KUG;
#X text 150 403 musil;
#X text 180 403 @;
#X text 186 403 iem.at;
#X text 101 392 (c) Thomas Musil 2000 - 2005;
#X text 149 425 Graz \, Austria;
#X connect 0 0 10 0;
#X connect 5 0 14 0;
#X connect 6 0 15 0;
#X connect 10 0 11 0;
#X connect 11 0 1 0;
#X connect 14 0 10 1;
#X connect 14 0 11 1;
#X connect 15 0 10 2;
#X connect 15 0 11 2;
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