Thermoconform

First, a reptile that thermoconforms while active (slope = 1) may still achieve a low variance in body temperature by restricting its activity to times and habitats with suitable microenvironments.

They must either thermoconform to their environment, if their environmental temperature is relatively constant or if they can tolerate fluctuations in T_b, or use behavioral regulatory mechanisms to maintain a T_b that is somewhat independent of environmental temperature.