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Gnuplot: Plotting with errorbar

Gnuplot: a versatile Graphing Tool for linux users

Plotting data in 3 columns, with first and second column as lines and third column as errorbars.
$gnuplot 
gnuplot> plot "file.dat" using 1:2 with lines, "" using 1:2:3 with yerrorbars
For using the same linetype for connecting lines and error bars:
$gnuplot 
gnuplot> plot "file.dat" using 1:2 with lines linetype 1, "" using 1:2:3 with yerrorbars linetype 1

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