... MIDAS

MIDAS is developed and distributed by the European Southern Observatory.

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...densities

For  $T_{\rm e} = 10^4$ K and our default atomic parameters, the [O II] ²D_5/2 and ²D_3/2 levels have an critical density of 1200 and 4300 cm^-3, respectively. The corresponding values for the corresponding two levels of [S II] are 1400 and 3600 cm^-3.

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