PyNeb: a new tool for analyzing emission lines - I. Code description and validation of results

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Table 6

Comparison between density diagnostics in NEBULAR and PyNeb.

Ion	Spectrum	Line Ratio	Value	Assumed T_e	N_e (NEBULAR)	N_e (PyNeb)


N⁰	[N i]	I(5198)/I(5200)	2.00	10 000 K	3420	3420
S⁺	[S ii]	I(6716)/I(6731)	0.75	10 000 K	1740	1740
C⁺	C ii]	I(2326)/I(2328)	1.60	10 000 K	100	100
O⁺	[O ii]	I(3726)/I(3729)	1.50	10 000 K	1100	1090
Si⁺²	Si iii]	I(1883)/I(1892)	0.10	10 000 K	772 100	771 300
Cl⁺²	[Cl iii]	I(5517)/I(5538)	0.75	10 000 K	6480	6470
N⁺²	N iii]	I(1749)/I(1752)	1.20	10 000 K	510	510
Ar⁺³	[Ar iv]	I(4711)/I(4740)	0.50	10 000 K	23 250	23 240
C⁺²	C iii]	I(1907)/I(1909)	0.40	15 000 K	115 800	114 400
O⁺³	O iv]	I(1401)/I(1405)	1.25	10 000 K	4640	4650
Ne⁺³	[Ne iv]	I(2423)/I(2425)	2.00	10 000 K	19 400	19 400

Notes. Densities have been rounded off to the tens for values below 10⁵ cm^-3 and to the hundreds elsewhere.

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