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set term pngcairo size 1000, 800
set grid
f1(x) = a1*x+b1
fit f1(x) '1dt(dp).plot' via a1, b1
set output '1dt(dp).png'
set title "График зависимости велечины, обратной температуре воздуха, от разницы давлений"
set xlabel "1/T (1/К)"
set ylabel "P (Па)"
set key top left
set label sprintf("A = %.4g\n B = %.4g", a1, b1) at graph 0.2, 0.9 front boxed
plot '1dt(dp).plot' notitle lc 0 pt 1 lw 2, \
f1(x) title "1/dT(dP)" lc rgb "red"
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