/usr/share/gem/examples/04.pix/16.alphaGrey.pd is in gem-doc 1:0.93.3-5ubuntu4.
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 135 336 pix_texture;
#X obj 135 393 square 2;
#X obj 135 171 pix_image ../data/fractalAlpha.TIF;
#X obj 135 308 pix_a_2grey 0.5;
#X obj 135 215 translateXYZ -2 0 0;
#X obj 386 140 gemhead;
#X obj 386 309 pix_texture;
#X obj 386 402 square 2;
#X obj 386 171 pix_image ../data/fractalAlpha.TIF;
#X obj 386 348 alpha;
#X obj 386 209 translateXYZ 2 0 0;
#X obj 228 13 pix_a_2grey;
#X text 261 55 grey's out all pixels \, of which the alpha-channel
is above a certain threshold;
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#X text 21 39 Create window and render;
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#X msg 350 172 1;
#X obj 390 150 t b;
#X msg 390 172 0;
#X obj 350 195 t f;
#X msg 350 219 set \$1;
#X text 118 122 rendering;
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#X restore 28 61 pd gemwin;
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