/usr/lib/pd/extra/iemlib/lp2_crit~.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 | #N canvas 321 86 420 316 10;
#X obj 22 42 inlet~;
#X obj 58 66 inlet;
#X obj 22 230 outlet~;
#X text 62 42 ~signal_in~;
#X text 95 67 <float> cutoff_frequency [Hz];
#X text 201 86 <float> interpolation_time [ms];
#X text 30 148 ~filtered signal_out~;
#X obj 167 86 inlet;
#X text 79 180 1.arg: <float> cutoff_frequency [Hz];
#X text 79 190 2.arg: <float> interpolation_time [ms] (opt.);
#X obj 22 107 lp2c~ \$1 1.2872 0.4142 \$2;
#X text 5 5 lp2_crit~;
#X text 81 5 lowpass 2.order with critical damping;
#X text 176 265 IEM KUG;
#X text 160 253 musil;
#X text 190 253 @;
#X text 196 253 iem.at;
#X text 111 242 (c) Thomas Musil 2000 - 2005;
#X text 159 275 Graz \, Austria;
#X connect 0 0 10 0;
#X connect 1 0 10 1;
#X connect 7 0 10 4;
#X connect 10 0 2 0;
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