I tried to do a fit with gnuplot as follows:
$gnuplot > fit a0+a1*(x)**(2)+a2*(x)**(4) "file.txt" via a0,a1,a2
and got the following results :
a0 = 0.552046
a1 = 0.355
a2 = 0.526979
Please advise how to get more decimal points for the results. For example,
the number of decimal points I would like to have to a0 is 12 (i.e., 12
decimal points).

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