Left panel: the MMRD plot for the LMC (blue points: He/N novae; red points: Fe II novae). Right panel: the MMRD plot for M31 (on the same scale) based on data from J. G. Clark et al. (2024). The large blue squares in both plots indicate known RNe. The dashed lines show the best linear fits with ﹩{M}_{V}=-8.77(\pm 0.26)+1.10(\pm 0.22)\,{\rm{log}}\,{t}_{2}﹩ and ﹩{M}_{V}=-8.62(\pm 0.21)+0.93(\pm 0.15)\,{\rm{log}}\,{t}_{2}﹩ for the LMC and M31, respectively.