/usr/share/texmf/tex/latex/gnuplot/gnuplot.cfg is in gnuplot-data 5.0.5+dfsg1-6+deb9u1.
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 | %% A configuration file for the epslatex terminal by Harald Harders.
%% This file is part of Gnuplot.
%%
\usepackage[T1]{fontenc}
\endinput
%%
%% End of file `gnuplot.cfg'.
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