HRD with the possible location of W49nr1 marked as a vertically hashed area and horizontally hashed, taking into account different extinction laws. The three black filled circles stand for an O2If*, an O3I, and an O4I star, respectively. Left panel: Geneva evolution tracks (Ekström et al. 2012; Yusof et al. 2013) without stellar rotation (solid line) and with rotation (dashed line) for different masses are overplotted. Right panel: main sequence isochrones with different ages, again without stellar rotation (solid line) and with rotation (dashed line).
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