Absolute V-band plateau magnitudes (computed at day 50) versus ejected nickel mass. Black circles represent the LL SN IIP sample (from Table 1), green squares are the SNe IIP from Hamuy (2003). SN 2020cxd is shown as a red data point. The grey dashed vertical lines represent the average nickel mass for different types of CC SNe from Anderson (2019). We perform linear fits on M_V and log M_Ni for the Hamuy 2003 sample and for the LL SN IIP sample. The best fits are shown as the green and black dashed lines and give consistent relations.