/usr/share/gmt/cpt/viridis.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 D, via cpt-city
# Design: Nathaniel J. Smith, Stefan van der Walt, and Eric Firing
#
#----------------------------------------------------------
# COLOR_MODEL = RGB
#----------------------------------------------------------
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0.07451 72/28/110 0.07843 72/29/111
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0.93725 213/226/26 0.94118 216/226/25
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0.96078 229/228/25 0.96471 231/228/25
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0.98824 246/230/32 0.99216 248/230/33
0.99216 248/230/33 0.99608 251/231/35
0.99608 251/231/35 1.00000 253/231/37
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