Fig. 2.
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Log[N Vλ4603/N IVλ6380] × Log[N IVλ4058/N IIIλ4640] diagram for the O2 (violet crosses), O3 (blue star), O3.5 (gold triangles), and O4 (red triangles) spectroscopic standard stars (labeled by the blue text). The two O2V((f*)) stars of Westerlund 2, MSP183, and VPHAS-01273, and the three O3 Vλ(f*)) stars, VPHAS-01338, MSP182, and MSP199, are also indicated by the black text.
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