gen_grad_map = {
    dz =  0.002000,
    curve = {
      m    = 1,
      kind = sin,
      derivs = {
       1.9000:  1.480064565624E+00 -1.013137114040E+01 -5.827182097040E+02 -1.936851327979E+04 -7.355291851352E+05,
       1.9020:  1.458671911601E+00 -1.130150463157E+01 -6.206234197776E+02 -1.993080601541E+04 -6.904484509088E+05,
       1.9040:  1.434885536895E+00 -1.253111444356E+01 -6.588569415553E+02 -2.003760936167E+04 -6.342234517808E+05
      }
    },
    curve = {
      m    = 3,
      kind = sin,
      derivs = {
       1.9000: -2.424013521470E+01 -7.968145515646E+02 -2.083528360550E+04  1.378945793744E+05  1.223572514986E+08,
       1.9020: -2.579812830049E+01 -8.176177239343E+02 -1.883280077024E+04  1.526338536560E+05  1.250046090449E+08,
       1.9040: -2.736357924503E+01 -8.192362865739E+02 -1.635863366959E+04  1.701301340246E+05  1.284442380396E+08
      }
    }
  }