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Table 2.

Properties of the infrared fine-structure cooling lines used in this study.

Ionization
Line λ Transition potentiala
(μm) (eV) (cm−3)
[ArII] 6.99 2P1∕22P3∕2 15.75 4 × 105
[ArIII] 8.88 3P13P2 27.63 3 × 105
[SIV] 10.51 2P3∕22P1∕2 34.78 5 × 104
[NeII] 12.81 2P1∕22P3∕2 21.56 7 × 105
[NeIII] 15.55 3P13P2 40.96 3 × 105
[SIII] 18.71 3P23P1 23.34 2 × 104
[SIII] 33.48 3P13P0 23.34 7 × 103
[SiII]c 34.81 2P3∕22P1∕2 8.15 2 × 103 [e]
4 × 105 [H]
[OIII] 88.36 3P13P0 35.12 5 × 102
[NII] 121.90 3P23P1 14.53 3 × 102
[CII]c 157.74 2P3∕22P1∕2 11.26 50 [e]
3 × 103 [H]

Notes. (a) Energy to create the ion. (b) Critical density for collisions with electrons. (c)For [SiII] and [CII] we quote the critical density for collisions with electrons and Hydrogen atoms.

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