Limiting sensitivity, in secondary stellar mass versus primary halo mass, of a number of previous studies of satellite abundance (from top right to bottom left, Conroy, Wechsler & Kravtsov 2006; Guo et al. 2011; Wang & White 2012; Sales et al. 2013; Speller & Taylor 2014; Zu & Mandelbaum 2015; Lan et al. 2016; Nierenberg et al. 2016; Besla et al. 2018; Carlsten et al. 2021; Mao et al. 2021; Roberts, Nierenberg & Peter 2021; Wang et al. 2021; Carlsten et al. 2022; Wu et al. 2022). Triangles indicate published luminosity functions; squares indicate published mass functions; pentagons indicate both, while circles indicate relative luminosity functions (i.e. number versus magnitude offset). Values are approximate, as discussed in the text; also note that SNR and redshift range vary from one study to another.