NaN, -25.0    , -15.0   ,  0.0   , 15.0   , 25.0
   0,  18.4228 ,   0.9547,  0     ,  8.3292,  9.7587
 2.5,   7.1360 ,   0.8313, -1.3200, -0.1005, -0.2685
 5.0,   0.5723 ,  -1.4201, -2.1482, -2.7177, -0.2552
10.0,  -3.9235 ,  -1.8243, -4.1803, -2.3825, -0.1750
15.0,  -2.9697 ,  -1.8095, -3.9642, -2.0616, -0.0025