> xeasy
> Goto plane           [gp]
> Zoom one region      [zo]
> Contour plot         [cp]
>  
> level and bas 1 -4132.708496
> level and bas 2 -2952.077637
> level and bas 3 -2108.769775
> level and bas 4 -1506.407104
> level and bas 5 -1076.147949
> level and bas 6 -768.819946
> level and bas 7 -549.299988
> level and bas 8 -392.500000
> level and bas 9 -280.500000
> level and bas 10 -200.500000
> level and bas 11 200.500000
> level and bas 12 280.500000
> level and bas 13 392.500000
> level and bas 14 549.299988
> level and bas 15 768.819946
> level and bas 16 1076.147949
> level and bas 17 1506.407104
> level and bas 18 2108.769775
> level and bas 19 2952.077637
> level and bas 20 4132.708496
>  
> Editing peaks              [ed]
> Draw cursor         [dc]
> Enlarge vertically   [ev]