know the intrinsic color and time-stretching factor $f_{\rm s}$ in order to analyze a particular nova light curve. The procedure is summarized as follows:\
[**1.**]{} Calculate the intrinsic colors of $(B-V)_0$ and $(U-B)_0$ as $$(B-V)_0 = (B-V) - E(B-V),
\label{dereddening_eq_bv}$$ and $$(U-B)_0 = (U-B) - 0.64 E(B-V),
\label{dereddening_eq_ub}$$ where the factor of $0.64$ is taken from @rie85. The color excess $E(B-V)$ is taken from literature, if available.\
[**2.**]{} Determine the time-stretching factor $f_{\rm s}$ of a target nova from a comparison with a template nova in the light/color curves (see, e.g., Figure \[v574\_pup\_v1974\_cyg\_v\_bv\_logscale\]). We adopt the template nova from one of LV Vul, V1500 Cyg, V1668 Cyg, and V1974 Cyg, of which the distance modulus $\mu_V\equiv (m-M)_V$ and extinction $E(B-V)$ are well determined. We use LV Vul as the template nova unless otherwise specified. The timescaling factor $f_{\rm s}$ is measured against the timescale of LV Vul. In the light/color curves, we stretch/squeeze the timescale of the target nova (horizontal shift in a logarithmic timescale) and also shift the magnitude in the vertical direction. The light curve of the target nova overlaps the template nova by stretching horizontally (in the time-direction) by a factor of $f_{\rm s}$ and by shifting 