Comparison of sizes measured in SDSS and LS. (a) Apparent r-band magnitude from LS and r−band magnitude obtained from SDSS of randomly selected galaxies. (b) Half-light radius from TRACTOR catalog of the LS survey and the r−band Petrosian half-light radius from SDSS of the randomly selected galaxies. (c) M_V converted using r_LS and r_SDSS. The black dashed lines in both panels are one-to-one relations. The orange line is the fitted relation of r-band magnitudes. (d) Mean error of the modeled size in LS as a function of M_r. The error bars represent the standard deviation of the error within each magnitude bin.