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tokens: the dendrogram structure, i.e. compact clumps, while the fainter symbols represent their parent structures. There is a hint of an increase in temperature with time, from an initial temperature K to K over a period Myr, as illustrated by the dashed line in panel b) ; note that the cool features from 0.7–0.9 Myr are at a significantly different velocity and therefore cannot be part of the same stream. The Brick is an outlier (it is hotter) whether or not there is a trend. The symbol sizes are proportional to the brightness and are meant to give an indication of how reliable the temperature measurements are. The gray vertical lines through the circles indicate the formal 1 errors on the temperature. Fig. 16 a) A temperature map derived from the NH 3 (1, 1)/(2, 2) line ratio from Ott et al. (2014) . The NH 3 thermometer has a more limited temperature range when using only these two lines, so the map is cut off at K. b) The -derived temperature map over the same region from Fig. 7 a. Figure 16 shows the Ott et al. (2014) temperature map in the same color scheme that we have used in Fig. 7 . There are some trends that are common between the two maps: the Sgr A complex and Sgr B2 complex are the warmest regions, the diffuse gas surrounding these is somewhat cooler, and the positive latitude component of the Molinari et al. (2011) “ring” is slightly warmer than the negative latitude component. The most significant difference occurs in the southwest portion of the Sgr B2 cloud. In this region, the NH 3 temperature ranges from the high ( K) temperatures of the Sgr B2 N hot ridge into a cooler background –40 K. By contrast, the temperatures stay high, indicating gas temperatures K extending to the southwest of Sgr B2 S. This difference probably indicates that there is a cool, diffuse component being detected in NH 3 , while is detecting a hotter, denser component. This region will provide a good comparison target for other thermometric observations. Further comparison of the NH 3 and thermometers is necessary, and will be possible with future ATCA and GBT surveys of higher ammonia transitions. These will be aided by observations of both higher and lower transitions ( Mangum Wootten 1993 ) to verify the presence of a cool, diffuse component. 5.6. Comparison to other measurements with p-H<inline-formula specific-use="simple-math"><sub>2</sub></inline-formula> CO The largest survey of temperatures prior to this work was by Ao et al. (2013) , who observed the inner 75 pc. They performed a similar analysis to ours but over a smaller area. They reported similar temperatures, with some small differences due to a different set of collision rates adopted (we used Wiesenfeld Faure 2013 , they used Green 1991 ). The Ao et al. (2013) survey found uniformly high temperatures within the bright Sgr A cloud complex. Our survey finds a greater variety in gas temperatures due to the larger area covered. There have also been observations of temperatures with