1[5 x 5 x 5]=>[10 x 10 x 10], interp err = 1.0343e+01 2[10 x 10 x 10]=>[20 x 20 x 20], interp err = 2.4702e+00 3[20 x 20 x 20]=>[40 x 40 x 40], interp err = 4.7587e-01 4[40 x 40 x 40]=>[80 x 80 x 80], interp err = 9.3027e-02 5