data test.dat xcolumn 1 ycolumn 2 ymin -2 ymax 3 xlabel Angle ylabel COS( Angle ) plot title Y Axis Using Fixed Scaling

This creates a graph like this. *plotl*
will allow the curve to extend beyond the bounds of the axes if so directed;

data test.dat xcolumn 1 ycolumn 2 ymin -1 ymax 0.5 xlabel Angle ylabel COS( Angle ) plot title Whoops!

with results like this. This can be useful
at times. If you want to focus in on a narrow range of the data,
but don't want the curve drawn outside the axes box, use the
`clip` command;

data test.dat xcolumn 1 ycolumn 2 ymin -1 ymax 0.5 xlabel Angle ylabel COS( Angle ) clip plot title That's Better

giving this graph.