/usr/share/slsh/cmaps/jet.map is in slsh 2.2.4-3ubuntu1.
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 | % -*- slang -*-
% This color map was derived from GMT_jet.cpt
% Copyright (c) 1991-2004, P. Wessel & W. H. F. Smith
$1 = [0x00,0x1F,0x00,0x00, 0x1F,0x5F,0x00,0x00, 0x5F,0x9F,0xFF,0xFF, 0x9F,0xDF,0xFF,0xFF, 0xDF,0xFF,0xFF,0x7F];
$2 = [0x00,0x1F,0x00,0x00, 0x1F,0x5F,0x00,0xFF, 0x5F,0x9F,0xFF,0xFF, 0x9F,0xDF,0xFF,0x00, 0xDF,0xFF,0x00,0x00];
$3 = [0x00,0x1F,0x7F,0xFF, 0x1F,0x5F,0xFF,0xFF, 0x5F,0x9F,0xFF,0x7F, 0x9F,0xDF,0x00,0x00, 0xDF,0xFF,0x00,0x00];
png_add_colormap ("jet", png_build_colormap (__tmp($1),__tmp($2),__tmp($3)));
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