Table 5: Comparison of elemental abundances from different sources.
Object He N O Ne S Cl Ref.
NGC 1535 11.02 7.11 8.41 7.86     [1]
  10.96   8.58 7.97     [2]
  10.99 7.63 8.51 7.89     [3]
NGC 2438 11.05 8.10 8.63 8.11 6.69 5.04 [1]
  11.11 8.24 8.68       [5]
  11.15 8.00 8.38 7.60 6.51   [6]
NGC 2440 11.10 8.79 8.49 8.01 6.44 4.76 [1]
  11.18 9.09 8.82 8.14     [2]
  11.11 8.71 8.64 8.13 6.67   [6]
  11.08 8.98 8.64 7.95 6.30 5.11 [7]
  11.09 8.26 8.39 8.04     [8]
NGC 3132 11.10 8.46 8.77 8.49 7.06 5.42 [1]
  11.11 8.68 8.98 8.56     [2]
  11.08 8.37 8.82 8.49 7.02 5.36 [8]
NGC 3242 11.02 7.62 8.49 7.81 6.41 4.93 [1]
  11.03 7.71 8.72 8.03     [2]
  11.00 7.53 8.52 7.89 6.38 4.94 [8]
  10.96 7.96 8.64 8.04 6.51   [9]
  10.95 7.91 8.66 7.85 6.69 5.06 [4]
NGC 6302 11.18 8.72 8.18 7.81 6.50 4.75 [1]
  11.13 8.52 8.40 7.88 6.75 4.99 [8]
  11.23 8.76 8.41   6.69   [10]
  11.26 8.92 8.70 7.99 6.80 5.59 [11]
NGC 7009 11.07 8.24 8.66 8.13 6.97 5.29 [1]
  11.06 8.44 8.93 8.37     [2]
  11.07 8.40 8.66 8.04 6.98   [6]
  11.04 8.23 8.67 8.04 6.92   [12]
  11.07 8.10 8.68 8.16 7.12   [13]
Orion 10.99 7.78 8.72 7.89 7.17 5.33 [14]
Sun 10.99 7.97 8.87 8.08 7.33 5.50 [15]
References: [1] this paper; [2] Torres-Peimbert & Peimbert (1977); [3] Barker (1989); [4] Aller & Czyzak (1983); [5] Guerrero & Manchado (1999); [6] Kingsburgh & Barlow (1994); [7] Hyung & Aller (1998); [8] Tsamis et al. (2003); [9] Barker (1985); [10] de Freitas Pacheco et al. (1991); [11] Aller et al. (1981); [12] Gonçalves et al. (2003); [13] Barker (1983); [14] Esteban et al. (1998); [15] Grevesse et al. (1996).

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