a) H112α electron temperature map showing in K. b) H77α electron temperature map showing in K. c) Measured electron temperature in the 6 cm vs. the 2 cm band at each spatial pixel with significant detected RRL emission. The contours show regions of increasing pixel density. The x marks the median and the + marks the mean over all valid pixels. d) Same as b), but with integrated He77α contours at levels [0.0125, 0.025, 0.05, 0.1, 0.15, 0.2] K km s^-1 overlaid. The contours on the right side (ℓ< 49) most likely trace noise, since the noise in that region is higher.