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set terminal postscript
set samples 200
set output "teplomer.ps"
set key off
set xlabel "t [ C]"
set ylabel "rozdil hladin [mm]"
set grid
f(x)=a*x
fit f(x) "teplomer.txt" using 1:2 via a
plot "teplomer.txt" using 1:2, f(x)
!ps2pdf teplomer.ps