/usr/lib/pd/extra/mapping/env.pd is in pd-mapping 0.2-2.
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 16 | #N canvas 788 247 294 499 10;
#X obj 59 42 inlet;
#X obj 80 431 outlet;
#X obj 130 42 inlet;
#X obj 90 132 t f f;
#X obj 91 218 -;
#X obj 131 165 env- \$1;
#X obj 78 164 env+ \$1;
#X connect 0 0 3 0;
#X connect 2 0 6 1;
#X connect 2 0 5 1;
#X connect 3 0 6 0;
#X connect 3 1 5 0;
#X connect 4 0 1 0;
#X connect 5 0 4 1;
#X connect 6 0 4 0;
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