/usr/lib/pd/extra/iemlib/hp9_cheb~.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 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 30 208 ~filtered signal_out~;
#X obj 167 86 inlet;
#X text 142 17 and +1 dB passband-ripple;
#X text 97 226 1.arg: <float> cutoff_frequency [Hz];
#X text 97 236 2.arg: <float> interpolation_time [ms] (opt.);
#X text 5 5 hp9_cheb~;
#X text 81 5 highpass 9.order with chebyshev characteristic;
#X obj 22 189 hp1c~ \$1 6.3415 \$2;
#X obj 22 168 hp2c~ \$1 2.1252 7.1711 \$2;
#X obj 22 148 hp2c~ \$1 0.5624 2.3278 \$2;
#X obj 22 127 hp2c~ \$1 0.2076 1.3166 \$2;
#X obj 22 107 hp2c~ \$1 0.0562 1.0258 \$2;
#X text 176 275 IEM KUG;
#X text 160 263 musil;
#X text 190 263 @;
#X text 196 263 iem.at;
#X text 111 252 (c) Thomas Musil 2000 - 2005;
#X text 159 285 Graz \, Austria;
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#X connect 17 0 16 0;
#X connect 17 1 16 1;
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