Power to detect relative reproductive success. Simulations are performed using demographic and sampling information of Burrishoole Atlantic salmon, and with varying group size proportions between high and low reproductive success groups. Panels a and b show average power within cohorts, for females (a), and when both sexes combined (b). Panels c and d show the power when cohorts’ information is combined for females (c), and when both sexes combined (d). Only higher than 80% power are shown. Tick marks on the xy plane and mesh vertices correspond to simulated points. Note that simulations are performed at finer intervals when a finer resolution is required, i.e. when comparing smaller reproductive success differences. The outer and the inner surfaces show results when parentages are resolved with 28 and 14 loci, respectively. (See Additional file 8 for full surface views, and male specific power curves).