> xeasy
> Contour plot         [cp]
>  
> level and bas 1 -4132.708984
> level and bas 2 -2952.077881
> level and bas 3 -2108.770020
> 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 2108.770020
> level and bas 19 2952.077881
> level and bas 20 4132.708984
>  
> Contour plot         [cp]