Results of the model for different values of T parameter (time to oestrus when signalling starts). Two other parameters are constant, c = 0.01 and tau = 0.05. Scenario 0 models d and D males being equally competitive in situations involving sperm competition. Scenario 1 assumes D males having a competitive advantage in situations involving sperm competition. X axis – proportion of S females, y axis – proportion of D males. Colours separate regions where the currently winning strategies (that are predicted to increase in frequency) are {s,d} (black), {s,D} (rose-coloured), {S,d} (olive-green), and {S,D} (white), with arrows aiding the interpretation, space-permitting. Figure shows that the model is relatively insensitive to the variation in T.