/usr/lib/pd/extra/iemlib/vcf_lp2~.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 | #N canvas 216 218 415 401 10;
#X obj 22 42 inlet~;
#X obj 22 288 outlet~;
#X text 71 41 ~signal_in~;
#X text 32 256 ~filtered signal_out~;
#X text 12 8 vcf_lp2~;
#X text 138 283 no arg.;
#X obj 64 70 inlet~;
#X obj 133 97 inlet~;
#X text 179 97 <signal> Q [-];
#X text 110 71 <signal> cutoff_frequency [Hz];
#X obj 22 237 vcf_filter~ lp2;
#X text 85 8 lowpass 2.order with signal-inlets;
#X text 130 20 for frequency and Q;
#X obj 63 206 iem_cot~;
#X text 166 355 IEM KUG;
#X text 150 343 musil;
#X text 180 343 @;
#X text 186 343 iem.at;
#X text 101 332 (c) Thomas Musil 2000 - 2005;
#X text 149 365 Graz \, Austria;
#X connect 0 0 10 0;
#X connect 6 0 13 0;
#X connect 7 0 10 2;
#X connect 10 0 1 0;
#X connect 13 0 10 1;
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