> xeasy
> Contour plot         [cp]
>  
> level and bas 1 -8264.916992
> level and bas 2 -5903.655273
> level and bas 3 -4217.039551
> level and bas 4 -3012.314209
> level and bas 5 -2151.795898
> level and bas 6 -1537.139893
> level and bas 7 -1098.099976
> level and bas 8 -784.500000
> level and bas 9 -560.500000
> level and bas 10 -400.500000
> level and bas 11 400.500000
> level and bas 12 560.500000
> level and bas 13 784.500000
> level and bas 14 1098.099976
> level and bas 15 1537.139893
> level and bas 16 2151.795898
> level and bas 17 3012.314209
> level and bas 18 4217.039551
> level and bas 19 5903.655273
> level and bas 20 8264.916992
>  
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> 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
>  
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