gnuplot help 1

Here is how to get multiple plots in a single graph in gnuplot

plot 'data.dat' using 1:2 with lines, 'data.dat' using 1:3 with lines

- 'data.dat' is the file containing the data.
- using 1:2, uses the column 1 as x-axis, and column 2 as the y-axis
- with lines, plots by joining the points on the graph