Measured normalizations of the Gaussian line at 14.82 Å plotted against the Hα line luminosities taken from Hamer et al. (2016). As a reference, we also plot the expected O VIII Lyδ line strength for the Perseus cluster, estimated based on the CX model that best fits the Hitomi data (Hitomi Collaboration et al., in prep.). A solar abundance ratio is assumed since the Hitomi spectrum does not cover the oxygen band. The Hα luminosity of the Perseus cluster is taken from Conselice et al. (2001).