Panel a): color composite RGB image of the B − V − I mosaics from the Massey et al. (2006) survey. Panel b): stellar mass map derived from the median likelihood estimator (described in Sect. 3.1) based on LGS BVI bands. Panel c): stellar mass map obtained from the Bayesian median likelihood estimator, based on the full LGC and SDSS BVIgi dataset. Panel d): apparent stellar M/L derived from median likelihood stellar mass map based on LGS+SDSS BVIgi bands and the observed LGS V-band surface brightness.