How can I plot multiple columns from multiple files using plot?

I have four .dat files each containing three columns. The first column is supposed to be my data for X-axis whereas the second and third columns shall be the Y axis values. In each file the total number of X-axis values are different (but range is similar). However, I want to plot all the Y-axes values from all files against the X-axis in a single graph. Can you please provide a way to do so? Thanks

Answer 1

[Thorsten]

That's straightforward, given that D1 is your N*3 file

 plot(D1(:,1), D1(:,2:3)')
 hold on

Load another data D2

 plot(D2(:,1), D2(:,2:3)')

and so on.

[Suchetana Gupta]

Thanks. It did occur. But for two data sets I got the same colour plot (for two sets of values. I can differentiate on inspection). Is it possible to change colour? Also, is it possible to add colour label? Thanks