Left: differential emission measure as a function of temperature determined from the AIA intensities along the track shown in Fig. 7. The initial intensity has been assumed to be the background intensity and has been subtracted. The dashed curve is a two-Gaussian fit. Right: electron number density, assuming a 10 Mm line-of-sight depth, as a function of EM-weighted average temperature over the interval 5.5 ≤ log T ≤ 6.5.