Pre-outburst SED suggesting either flat spectrum or Class I membership (panel a). The same panel shows results of the dereddened quiescent data modelling. Position of the star in the H-R diagram based on modelling results (panels b&c); the one obtained with the assumption of the optimal temperature (5300 K) and distance (3.3 kpc) is indicated by the largest dot. The size of the dot fairly well represent the uncertainty in L_* and R_* caused by uncertainty in distance (3.0–3.6 kpc); Similar size should be applied to the two small dots to indicate uncertainties.