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/usr/lib/pd/extra/rtc/smooth-line-help.pd is in pd-rtclib 4.1-1.

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#N canvas 0 48 676 306 10;
#X floatatom 157 108 5 0 0 1 smooth_interval_(ms) - -;
#X obj 50 131 smooth-line 1000;
#X floatatom 50 158 5 0 0 1 smooth_output - -;
#X text 23 51 Interpolates smoothly between successive input values.
;
#X text 23 19 smooth-line;
#X msg 269 21 Envelopes;
#X floatatom 50 97 5 0 0 0 - - -;
#X msg 94 97 stop;
#X text 33 197 1999 by Karlheinz Essl;
#X text 34 217 Pd: 2006 Frank Barknecht;
#X connect 0 0 1 1;
#X connect 1 0 2 0;
#X connect 6 0 1 0;
#X connect 7 0 1 0;