Table 2: Electron density indicators in Me 2-1.
Ion Ioniz. Lines Observed $N_{\rm e}$
  Pot. (eV) Used Ratio (cm-3)
[S II] 10.4 6731/6716 1.37 1900
  13.6 3626/3729 1.24 1800
  23.8 5538/5518 0.93 1600
  24.4 1907/1909 1.27 1200


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