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jane12057-sup-0001-FigS1.tifimage/tif259KFig. S1. Plots of the raw data illustrating standardized annual reproductive success for alpha males that (a) had no prior beta experience (N = 20 individuals) and (b) cooperated as beta males before attaining alpha status (N = 28 individuals). Each individual is denoted by a different colour of marker, the first appearance of each individual represents his first year of alpha status, and data from all years of alpha status from the same individual are connected by a similarly coloured line. Data from 2004 are denoted with a filled square, as standardization of siring success differed in this year due to a short field season (see methods). When the final year of alpha status was observed, that year is marked with an open circle.

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