c these are the asserts for the two cases lowd0.in and lowdm6.in
c they are the same except for the density - the second is below
c the lowest possible density for a steady state cloud.
assert temperature hydrogen 2 4.018
assert ionization hydrogen 1 -3.053
assert ionization Helium 2 -1.078 
assert ionization Carbon  3 -0.668 
assert ionization Nitrogen 4 -0.227 
assert ionization Oxygen  4 -0.181 
assert ionization Magnesium 4 -0.280 
assert ionization Silicon 4 -0.511 
assert line "O  3" 5007 3.66
assert line "O  4" 258 28.31
assert line "Ne 5" 243 3.791
assert line "Ne 5" 143 3.455
assert line "S  4" 105 3.138