/usr/share/gem/examples/04.pix/09.Histogram.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | #N canvas 0 0 764 557 10;
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#X text 78 8 pix_curve: adjust the colour of an image;
#X text 451 213 separate tables for r \, g \, b and a;
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#X msg 95 289 set red green blue alpha;
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#X obj 303 328 pix_histo red green blue;
#X obj 302 288 pix_histo red green blue alpha;
#X text 313 388 one histogramm for all channels (making grey out of
rgb);
#X text 326 346 histograms for r \, g \, b;
#X text 337 306 histograms for r \, g \, b \, a;
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