/usr/lib/pd/extra/iemlib/lp1c~.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.
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#X obj 22 42 inlet~;
#X obj 55 66 inlet;
#X obj 22 194 outlet~;
#X text 62 42 ~signal_in~;
#X text 92 67 <float> cutoff_frequency [Hz];
#X text 189 134 <float> interpolation_time [ms];
#X text 32 176 ~filtered signal_out~;
#X obj 88 93 inlet;
#X obj 155 134 inlet;
#X text 124 93 <float> frequency-shift [-];
#X text 12 8 lp1c~;
#X text 60 8 lowpass 1.order for filter-cascades;
#X obj 22 157 filter~ lp1c \$1 \$2 1 \$3;
#X obj 55 214 outlet;
#X obj 86 232 outlet;
#X obj 115 251 outlet;
#X obj 155 271 outlet;
#X text 127 231 dummy;
#X text 155 250 dummy;
#X obj 123 113 inlet;
#X text 158 113 dummy;
#X text 120 192 1.arg: <float> cutoff_frequency [Hz];
#X text 120 202 2.arg: <float> frequency-shift [-];
#X text 120 212 3.arg: <float> interpolation_time [ms] (opt.);
#X text 176 315 IEM KUG;
#X text 160 303 musil;
#X text 190 303 @;
#X text 196 303 iem.at;
#X text 111 292 (c) Thomas Musil 2000 - 2005;
#X text 159 325 Graz \, Austria;
#X connect 0 0 12 0;
#X connect 1 0 12 1;
#X connect 1 0 13 0;
#X connect 7 0 12 2;
#X connect 8 0 12 4;
#X connect 8 0 16 0;
#X connect 12 0 2 0;
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