> xeasy
> Contour plot         [cp]
>  
> level and bas 1 -16529.335938
> level and bas 2 -11806.811523
> level and bas 3 -8433.580078
> level and bas 4 -6024.128418
> level and bas 5 -4303.091797
> level and bas 6 -3073.779785
> level and bas 7 -2195.699951
> level and bas 8 -1568.500000
> level and bas 9 -1120.500000
> level and bas 10 -800.500000
> level and bas 11 800.500000
> level and bas 12 1120.500000
> level and bas 13 1568.500000
> level and bas 14 2195.699951
> level and bas 15 3073.779785
> level and bas 16 4303.091797
> level and bas 17 6024.128418
> level and bas 18 8433.580078
> level and bas 19 11806.811523
> level and bas 20 16529.335938
>