/usr/lib/pd/extra/iemlib/lp6_butt~.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 53 66 inlet;
#X obj 22 230 outlet~;
#X text 62 42 ~signal_in~;
#X text 90 67 <float> cutoff_frequency [Hz];
#X text 183 86 <float> interpolation_time [ms];
#X text 31 164 ~filtered signal_out~;
#X obj 149 86 inlet;
#X text 5 5 lp6_butt~;
#X text 81 5 lowpass 6.order with butterworth characteristic;
#X obj 22 127 lp2c~ \$1 1.41421 1 \$2;
#X obj 22 107 lp2c~ \$1 0.517638 1 \$2;
#X obj 22 146 lp2c~ \$1 1.93185 1 \$2;
#X text 77 190 1.arg: <float> cutoff_frequency [Hz];
#X text 77 200 2.arg: <float> interpolation_time [ms] (opt.);
#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 11 0;
#X connect 1 0 11 1;
#X connect 7 0 11 4;
#X connect 10 0 12 0;
#X connect 10 1 12 1;
#X connect 10 4 12 4;
#X connect 11 0 10 0;
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#X connect 12 0 2 0;
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