The thermistors are at the midway point on the bar. Thus, we would expect to see a time lag between when the heater is turned on and when we detect a tempera- ture change. As a result, we also expect to see some oscillations in the bar temperature at the mea- surement point. This is born out by the simulation results shown in Figs 10a and b, where we can see about 0.25 Kelvin oscillations in temperature.