Updated integrated radio continuum spectrum of SNR G46.8–0.3 constructed using fluxes listed in Table 1. Blue circles correspond to fluxes extracted from the literature, whereas the green squares are our new measurements obtained from radio surveys (see text for details). The solid line is the best-fitting curve to the weighted data and yields a spectral index α = −0.535 ± 0.012 (S_v ∝ v^α). Shaded regions represent the variation of the best-fit values at 1- and 2-σ levels.