title test generating line ratios in a grid run
c 
c commands controlling continuum =====
blackbody 4e4 K
ionization parameter -2
c 
c commands for density & abundances =====
c these are to speed up the calculation, only do H, O, and Ne
init "honly.ini"
element oxygen on  
element neon on  
element sulphur on  
element oxygen ionization 1 1 1 0.01   
element neon ionization 1 1 1 0.01   
element sulphur ionization 1 1 1 0.01   
c vary the hydrogen density
hden 4 vary
grid 2 6.1 1 
c 
c other commands for details =======
c these are constant temperature models, vary T
constant temperature 4 vary
grid 4000 17000 3000 linear
stop zone 1 
c
c commands controlling output =====
save overview "func_grid_line_ratios.ovr"
save performance "func_grid_line_ratios.per"
save line list "func_grid_line_ratios.pun" "func_grid_line_ratios.dat" ratio no hash
save grid "func_grid_line_ratios.grd"
c
c commands giving (lack of) assert ==========
monitor nothing 0 
c
c func_grid_line_line_ratios.in
c class function
c ===================================================

This uses the grid command to compute line ratios for a wide range of
density and temperature.  The ionization is set to a uniform value and
only a few elements are included.  this makes the calculation faster
and prevents recombination [O III] 4363 from becoming important (there
is no O+3).

These are the line ratios mentioned as limits in the Johnstone et al.
Spitzer cooling flow filament paper (2007).