set xl "{/Arial-Italic P_1}[Pa]" set yl "{/Arial-Italic P_2}[Pa]" set logscale plot [1:10000][1:10000]"k.dat" using 1:2 title "較正直線" f(x)=a*x+b fit f(x) 'k.dat' using (log10($1)):(log10($2)) via a,b replot 10**(f(log10(x)))
こうすると1つ目のグラフしか表示されず color axis has cb coord of 0; must be above 0 for log scale ! と出てきます