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Comparison between the distance (in Mpc) from NGC 1399 of our sample galaxies versus their absolute r-band magnitude, using different sources for the distance estimates to our sample galaxies and NGC 1399. Left panel: adopting the Blakeslee et al. (2009) distances to the individual F3D galaxies and the Blakeslee et al. (2010) distance to NGC 1399 (21.1 Mpc). Middle panel: same as in the left panel but using the SBF distance to NGC 1399 derived by Tonry et al. (2001, 19.95 Mpc). Right panel: still using the Tonry et al. distance to NGC 1399 but using our PNLF-derived distances to our sample galaxies. The r-band magnitudes are from Iodice et al. (2019a) except for FCC 119, FCC 249, and FCC 255, which are estimated to be 13.5, 12.1 and 12.2 mag respectively.
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