/usr/lib/pd/extra/Gem/pix_refraction-help.pd is in gem 1:0.93.3-9build1.
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 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | #N canvas 0 0 654 531 10;
#X text 452 8 GEM object;
#X obj 8 335 cnv 15 430 130 empty empty empty 20 12 0 14 -233017 -66577
0;
#X text 39 338 Inlets:;
#X text 38 435 Outlets:;
#X obj 8 297 cnv 15 430 30 empty empty empty 20 12 0 14 -195568 -66577
0;
#X text 17 296 Arguments:;
#X obj 7 56 cnv 15 430 235 empty empty empty 20 12 0 14 -233017 -66577
0;
#X obj 449 77 cnv 15 170 250 empty empty empty 20 12 0 14 -228992 -66577
0;
#X text 453 60 Example:;
#X obj 514 254 cnv 15 100 60 empty empty empty 20 12 0 14 -195568 -66577
0;
#N canvas 0 0 450 300 gemwin 0;
#X obj 132 136 gemwin;
#X obj 67 89 outlet;
#X obj 67 10 inlet;
#X obj 67 41 route create;
#X msg 67 70 set destroy;
#X msg 142 68 set create;
#X msg 132 112 create \, 1;
#X msg 198 112 destroy;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 3 0 6 0;
#X connect 3 1 5 0;
#X connect 3 1 7 0;
#X connect 4 0 1 0;
#X connect 5 0 1 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X restore 519 293 pd gemwin;
#X msg 519 274 create;
#X text 515 253 Create window:;
#X obj 450 135 cnv 15 160 115 empty empty empty 20 12 0 14 -24198 -66577
0;
#X obj 451 84 gemhead;
#X text 71 31 Class: pix object;
#X obj 510 85 bng 15 250 50 0 empty empty pix_load 20 8 0 8 -262144
-1 -1;
#N canvas 0 0 587 366 image 0;
#X obj 77 48 inlet;
#X obj 77 344 outlet;
#X obj 77 205 pix_image examples/data/fractal.JPG;
#X obj 223 55 inlet;
#X msg 223 123 open \$1;
#X obj 223 100 openpanel;
#X connect 0 0 2 0;
#X connect 2 0 1 0;
#X connect 3 0 5 0;
#X connect 4 0 2 0;
#X connect 5 0 4 0;
#X restore 451 113 pd image;
#X text 63 307 <none>;
#X text 56 448 Outlet 1: gemlist;
#X text 63 352 Inlet 1: gemlist;
#X obj 451 253 pix_draw;
#X text 516 105 open an image;
#X text 509 118 (JPEG \, TIFF \, ..);
#X text 63 365 Inlet 1: 0|1 : apply/don't apply;
#X floatatom 464 177 3 0.01 16 1 - - -;
#X obj 35 477 cnv 15 375 20 empty empty empty 20 12 0 14 -260818 -66577
0;
#X text 44 480 (ported from "pete's plugins" \, www.petewarden.com)
;
#X msg 464 195 refract \$1;
#X msg 544 195 mag \$1;
#X floatatom 464 137 3 0 0 1 - - -;
#X floatatom 544 137 3 0 0 1 - - -;
#X msg 464 155 width \$1;
#X msg 544 155 height \$1;
#X obj 451 226 pix_refraction;
#X obj 544 176 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 1
1;
#X text 29 56 Description: display a pix through glass bricks;
#X text 80 158 range = 0.01 to 16 \, default = 2;
#X text 79 198 range = 1 to 255 \, default = 16;
#X text 80 230 range = 1 to 255 \, default = 16;
#X text 80 273 range = 0 or 1 \, default = 1;
#X text 28 77 The input image is broken up into rectangular cells \,
and scaled up or down within them. The effect is like looking through
a wall of glass bricks \, each acting as a magnifying or shrinking
lens for its part of the image;
#X text 37 138 How much to shrink or expand the input image within
each cell;
#X text 37 182 Width of each cell \, where 1 is the image width;
#X text 37 214 Height of each cell \, where 1 is the image height;
#X text 28 244 Turning this off prevents the image from being expanded
to larger than it's original size (within each cell);
#X text 63 380 Inlet 1: width <float>;
#X text 63 406 Inlet 1: mag 1|0;
#X text 63 421 Inlet 1: refract <float>;
#X text 63 392 Inlet 1: height <float>;
#X text 49 12 Synopsis: [pix_refraction];
#X connect 10 0 11 0;
#X connect 11 0 10 0;
#X connect 14 0 17 0;
#X connect 16 0 17 1;
#X connect 17 0 34 0;
#X connect 25 0 28 0;
#X connect 28 0 34 0;
#X connect 29 0 34 0;
#X connect 30 0 32 0;
#X connect 31 0 33 0;
#X connect 32 0 34 0;
#X connect 33 0 34 0;
#X connect 34 0 21 0;
#X connect 35 0 29 0;
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