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Fig. 4. Temporal profiles of Tb and B in conditions representing a large homeotherm (A), a homeotherm weighing a little less than 50 g (B) and a 10 g homeotherm (C). Time in arbitrary units. Solid lines, Tb; broken lines, B. Notice the asymptotically stable node in the large homeotherm condition, the asymptotically stable focus (damped oscillations) in the {equiv}50 g condition, and the centre (sustained oscillations) in the 10 g condition. Simulations were done in MatLab 6.1 and Simulink.