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Table 2.

Number of sources of different spectral types that are shown in Fig. 5: Nobs.

Type Teff [kK] Nobs Nsynt Nobs/Nsynt
O2−O3 > 44.7 2 54 0.04
O4−O5 40.8 − 44.7 12 71 0.19
O6 38.7 − 40.8 16 64 0.29
O7 36.9 − 38.7 31 81 0.45
O8 34.8 − 36.9 55 122 0.50
O9 31.6 − 34.8 116 140 0.80
B,A+ < 31.6 524 247 1.96

Notes. We also show the range of the effective temperature Teff covered by the spectral types; see also Table A.1. For comparison, we display the number of stars for each spectral type in our synthetic population (Nsynt), again assuming a total of 780 stars.

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