/usr/lib/pd/extra/rtc/smooth-line.pd is in pd-rtclib 4.1-2.
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 | #N canvas 366 287 335 349 10;
#X obj 134 35 inlet;
#X obj 76 34 inlet;
#X text 23 205 1999-2003 by Karlheinz Essl;
#X obj 76 177 outlet;
#X obj 76 147 line 0;
#X obj 76 115 pack 0 \$1;
#X obj 76 61 route float;
#X text 24 224 Pd: 2006 Frank Barknecht;
#X connect 0 0 5 1;
#X connect 1 0 6 0;
#X connect 4 0 3 0;
#X connect 5 0 4 0;
#X connect 6 0 5 0;
#X connect 6 1 4 0;
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