/usr/lib/pd/extra/mapping/center_point.pd is in pd-mapping 0.2.1-1.
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 16 | #N canvas 1 53 411 335 10;
#X obj 65 27 inlet;
#X obj 65 276 outlet;
#X obj 212 276 outlet;
#X obj 217 27 inlet;
#X obj 217 89 purepd/float_argument \$1 0.5;
#X obj 232 59 loadbang;
#X obj 65 205 mapping/reverse;
#X obj 65 178 mapping/disjoin;
#X connect 0 0 7 0;
#X connect 3 0 4 0;
#X connect 4 0 7 1;
#X connect 5 0 4 0;
#X connect 6 0 1 0;
#X connect 7 0 6 0;
#X connect 7 1 2 0;
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