Correlations between parameters of Type II SNe. Top left: Absolute g-band peak magnitude versus g-band rise time, with the first g-band point of SN 2016iog taken as a upper limit owing to the lack of rising-phase data; Top right: Absolute g/V-band peak magnitude versus the time above half-maximum (t_1/2), with the data from Drout et al. (2014) in the g-band, and those from Pursiainen et al. (2018), this work Table 2, and SN 2016iog in the V-band.; Bottom left: Absolute V-band magnitude at t = 50 days ($M_V^{50d}$) versus the ejected ⁵⁶Ni masses (M_Ni); Bottom right: V-band LC maximum decline rate (steepness parameter, S) versus the ejected ⁵⁶Ni masses (M_Ni). The weighted Pearson correlation coefficient (r_p), the Spearman rank correlation coefficient (r_s), and the number of SNe (N), are provided for each parameters pair. The dashed black line represents the linear relationship between the two parameters, and the yellow region indicates the error range. R² represents the coefficient of determination.