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Table 3:

Spectroscopic temperatures.

Nebula
$T_{\rm eff}$1 $T_{\rm eff}$2 $T_{\rm eff}$3

NGC 2392
40 000 45 000 47 000
NGC 3242 75 000 75 000 75 000
IC 418 39 000 37 000 36 000
NGC 6826 44 000 50 000  
NGC 1535     70 000
IC 2448     65 000

Notes. (1) Pauldrach et al. (2004); (2) Kudritzki et al. (1997); (3) Mendez et al. (1988).


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