Summary of rotational temperatures for all regions sampled around the CND defined based on the outflow in Sect. 3.2. The x-axis marks the region labels along with their locations around the CND (in brackets), while the y-axis indicates the rotational temperatures in the unit of K. The region code (along the x-axis) and color (the color of the data points) of each region match those in Table 2 and are defined in Sect. 3.2. The purple, yellow, pink, and lime dashed lines indicate the rotational temperatures at four different locations of the CND measured by Viti et al. (2014).