Fig. 12. The top line represents y=x, i.e. the correct homing distance. The middle line represents three leaky integrator models fitted to data (diamonds) taken directly from fig. 2 of Sommer and Wehner (2004). The models are Eqn 8 with =98.27, ß=0.0103 (taken from their paper), Eqn 9 with =103.2 and Eqn 10 with =193.6 (fitted using least squared error). The models are indistinguishable. Also shown as the bottom line is Eqn 10 with =18.38, the value obtained fitting the simplified analytic model (SAM) to the L-shaped journey experiments (see text), clearly a poor fit.