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set terminal pngcairo size 500, 500 enhanced font 'Verdana, 10'
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f(x) = -b * x
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fit f(x) 'data2' u 1:3 via b
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set xlabel 'T, deg'
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set ylabel 'q, мН/м'
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plot 'data2' using 1:3:2:4 w xyerrorbars title 'q-plot', f(x) title 'fitting line'
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pause -1 |