Fig. 1.
K-band spectra of new or reclassified O4-6 giant and supergiant stars within the Arches. Spectra of supergiant cluster members F20 and F29 are shown for comparison (blue) as are the template spectra for O5 III (HD 15558) and O6.5 III (HD 190864) stars (red; Hanson et al. 2005). Finally the spectrum of F23 from Paper I is reproduced (magenta) in order to illustrate the increased S/N in the new data and also the removal of spurious emission in the Brγ profile of this particular star.
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