26 1 3000. !nvrt
Z levels
1  -3000.
S levels
40. 0.5 7.  !h_c, theta_b, theta_f
   1 -1.
   2    -0.960000
   3    -0.920000
   4    -0.880000
   5    -0.840000
   6    -0.800000
   7    -0.760000
   8    -0.720000
   9    -0.680000
  10    -0.640000
  11    -0.600000
  12    -0.560000
  13    -0.520000
  14    -0.480000
  15    -0.440000
  16    -0.400000
  17    -0.360000
  18    -0.320000
  19    -0.280000
  20    -0.240000
  21    -0.200000
  22    -0.160000
  23    -0.120000
  24    -0.080000
  25    -0.040000
  26    0.