/usr/share/gem/examples/04.video/04.videoRTX.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 text 188 14 transform the x-axis into the t-axis and vice-versa
on the fly;
#X text 42 447 upper-picture;
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#X text 38 465 NO transformation;
#X text 198 467 RTX-tranformed;
#X text 46 24 =======;
#X text 380 248 lock time on x-axis;
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#X text 495 272 (default);
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