Rotational temperature and mass-loss rate throughout the inner 50′′ of the CSE. The rotational temperature (black dots) was derived from the ¹²CO(2–1)/¹²CO(1–0) ratio averaged in concentric rings centred on the star. The green curve is the kinetic temperature close to the star calculated from results of previous works. The grey region accounts for the 1σ error interval of the rotational temperature. The vertical dashed grey line indicates the distance from the star where the rotational temperature changes its behaviour (≃15″). The black continuous lines are the fits to the data set up to 15′′ (T_rot ∝ r^-0.68) and beyond (T_rot ≃ 35 K). The thin colored lines represent the mass loss rate (right axis scale) calculated on the ¹³CO map by averaging 5°-wide sectors oriented N, S, E and W (continuous and dashed red, and continuous and dashed blue curves, respectively) . The magenta line is the average mass-loss rate and the hatched region depicts the typical deviation (see text).