Left panel: Hα EW time evolution for the full CSP SN IIn sample and several objects in the literature including: SNe 1998S (Leonard et al. 2000), 2005db (Kiewe et al. 2012), and 2009kn (Kankare et al. 2012). Right panel: Hα luminosities for the full CSP SN IIn sample compared to those of some objects in the literature. Data for SNe 2005db and 1998S are from the spectra published by Kiewe et al. (2012), and Fassia et al. (2001). The Hα fluxes of SN 1994W were published by Chugai et al. (2004).