54 18 100. !nvrt
Z levels
1  -5000.
2  -2300.
3  -1800.
4  -1400.
5  -1000.
6  -770. 
7  -570. 
8  -470. 
9  -390. 
10 -340. 
11 -290. 
12 -240. 
13 -190. 
14 -140.
15 -120.
16  -110.
17  -105. 
18  -100.
S levels
30. 0.7 10.  !h_c, theta_b, theta_f
   18    -1.
   2    -0.972222
   3    -0.944444
   4    -0.916667
   5    -0.888889
   6    -0.861111
   7    -0.833333
   8    -0.805555
   9    -0.777778
  10    -0.750000
  11    -0.722222
  12    -0.694444
  13    -0.666667
  14    -0.638889
  15    -0.611111
  16    -0.583333
  17    -0.555555
  18    -0.527778
  19    -0.500000
  20    -0.472222
  21    -0.444444
  22    -0.416666
  23    -0.388889
  24    -0.361111
  25    -0.333333
  26    -0.305555
  27    -0.277777
  28    -0.250000
  29    -0.222222
  30    -0.194444
  31    -0.166666
  32    -0.138889
  33    -0.111111
  34    -0.083333
  35    -0.055555
  36    -0.027777
  37 0.