V − R color-magnitude diagram for the AAVSO photometric bands. The blue dots show the AAVSO photometry. The color was computed by combining the closest in time observations during the same nights. The red arrow displays the reddening vector for A_V = 1 mag and R_V = 3.1 using the extinction law by Cardelli et al. (1989). Synthetic photometry data obtained on the X-Shooter spectra and REM photometry is also shown.