Position for our NGC 55 sample in the FGLR (black dots). Previous studies performed by Kudritzki et al. (2008), Urbaneja et al. (2008) and U et al. (2009) in different galaxies are also displayed (open circles), the linear relationship proposed by Kudritzki et al. (2008) (see Eq. (1)) is drawn with a solid black line. The NGC 55 stars that have shown stronger discrepancies between the spectroscopic and evolutionary masses are marked as in Fig. 7 (see Sect. 4.1 for additional details).
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