NaN, -25.0   , -15.0    ,  0.0     ,  15.0    ,  25.0
 0.0,  7.3634 ,   2.1378 ,  0.0     ,   7.2051 ,  17.4188
 2.5,  0.1584 ,  -7.0467 , -11.5598 ,  -6.1758 ,   1.0293
 5.0, -4.1964 , -13.3017 , -12.5891 , -12.3515 ,  -4.2755
10.0, -4.6714 , -15.3603 , -19.4774 , -18.6065 , -11.1639
15.0, -4.4339 , -17.3397 , -23.5154 , -20.3484 , -16.0728