Can anyone tell me how to get stsdas.analysis.nebular.temden to compute densities from the C III ratio? It's working fine for the [O II] and [S II] doublets. But for C III, I get "Density calculation failed". Key pars below. Thanks in advance for advice! -Jane

flxratio= 0.6
(atom = carbon
(spectru= 3)
(transit= default)
(assume = 10000.)

We haven't historically gotten a lot of questions about the NEBULAR package, you might also want to post your question to the STScI helpdesk (help@stsci.edu). Otherwise you can use the search bar to look for similar questions in the forum, e.g.

http://iraf.net/phpBB2/viewtopic.php?t=84964&highlight=temden

might be of help.