> i just can't get my head round what that "using" parameter in gnuplot
> does.
Data file format:
# column 1, 2, 3, 4 ...
x1 y11 y12 y13 y14 ...
x2 y21 y22 y23 y24 ...
...
gnuplot> plot "foo.dat" using 1:3, "foo.dat" using 1:4, "foo.dat" using 2:4
will plot three graphs in the same plot: column 1 vs. column 2,
column 1 vs. column 4, and column 2 vs. column 4.
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