/usr/share/gmt/cpt/inferno.cpt is in gmt-common 5.4.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# New matplotlib colormap Option B, via cpt-city
# Design: Nathaniel J. Smith and Stefan van der Walt
#
#----------------------------------------------------------
# COLOR_MODEL = RGB
#----------------------------------------------------------
0.00000 0/0/4 0.00392 1/0/5
0.00392 1/0/5 0.00784 1/1/6
0.00784 1/1/6 0.01176 1/1/8
0.01176 1/1/8 0.01569 2/1/10
0.01569 2/1/10 0.01961 2/2/12
0.01961 2/2/12 0.02353 2/2/14
0.02353 2/2/14 0.02745 3/2/16
0.02745 3/2/16 0.03137 4/3/18
0.03137 4/3/18 0.03529 4/3/20
0.03529 4/3/20 0.03922 5/4/23
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0.04314 6/4/25 0.04706 7/5/27
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0.06275 11/7/36 0.06667 12/8/38
0.06667 12/8/38 0.07059 13/8/41
0.07059 13/8/41 0.07451 14/9/43
0.07451 14/9/43 0.07843 16/9/45
0.07843 16/9/45 0.08235 17/10/48
0.08235 17/10/48 0.08627 18/10/50
0.08627 18/10/50 0.09020 20/11/52
0.09020 20/11/52 0.09412 21/11/55
0.09412 21/11/55 0.09804 22/11/57
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0.10588 25/12/62 0.10980 27/12/65
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0.11765 30/12/69 0.12157 31/12/72
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0.83137 252/180/24 0.83529 251/182/26
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0.86667 250/198/45 0.87059 249/199/47
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0.89412 247/211/64 0.89804 246/213/67
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0.90980 245/219/76 0.91373 244/221/79
0.91373 244/221/79 0.91765 244/223/83
0.91765 244/223/83 0.92157 244/225/86
0.92157 244/225/86 0.92549 243/227/90
0.92549 243/227/90 0.92941 243/229/93
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0.93725 242/232/101 0.94118 242/234/105
0.94118 242/234/105 0.94510 241/236/109
0.94510 241/236/109 0.94902 241/237/113
0.94902 241/237/113 0.95294 241/239/117
0.95294 241/239/117 0.95686 241/241/121
0.95686 241/241/121 0.96078 242/242/125
0.96078 242/242/125 0.96471 242/244/130
0.96471 242/244/130 0.96863 243/245/134
0.96863 243/245/134 0.97255 243/246/138
0.97255 243/246/138 0.97647 244/248/142
0.97647 244/248/142 0.98039 245/249/146
0.98039 245/249/146 0.98431 246/250/150
0.98431 246/250/150 0.98824 248/251/154
0.98824 248/251/154 0.99216 249/252/157
0.99216 249/252/157 0.99608 250/253/161
0.99608 250/253/161 1.00000 252/255/164
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