If you don't want to use Excel or its Linux equivalent ("gexcel"? "kexcel"?), it behooves you to learn Gnuplot, write the data as columns to a file, then 
    plot 'FILENAME'

[download]
Gnuplot is extensively documented via its 'help' command, which contains many useful examples.

In reply to Re: Easy plotting ? by educated_foo
in thread Easy plotting ? by jflevi

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