Two-dimensional histograms showing the relation between the mean temperature difference between the two snapshots separated 100 s in time, and the mean ambipolar heating rate, Q_AMB at heights between 0.56 Mm and 1.1 Mm and at locations where Q_AMB exceeds a certain value. The progressively more red colors indicate a progressively larger number of points in a given interval of values of dT and Q_AMB.