ALMA data of KCl after stacking together the individual KCl transitions detected in this work from Table 2 and Fig. A.4. Top: velocity channel maps rotated by 25° clockwise so the symmetry axis of the disk is vertical; contours are 1σ, 2σ,… by 1σ (σ = 0.5 mJy beam⁻¹). In this case, maps were restored using natural weight and a clean beam with HPBW = 0″.03 × 0″.03, plotted at the bottom-left corner of each panel. The center of the dust disk (dashed ellipse) inferred from the continuum emission maps is marked with a cross (RA = 07^h42^m 16.91500 and Dec= −14°42′50″.0716, J20000) and has been adopted as the origin of positional offsets in these and all subsequent figures illustrating image data. The position of the central mass-losing star QX Pup, slightly offset from the map (or disk) center, is marked with a star-like symbol. Bottom-left: zeroth moment map over the V_LSR = [24:46] km s⁻¹ velocity range; contours are 2σ, 3σ … by 1σ (σ = 2.1 mJy beam⁻¹). Bottom-center: first moment map; contours going from V_LSR = 26 to 44 by 1 km s⁻¹. The wedge indicates the color-V_LSR relationship. Bottom-right: integrated 1d-spectrum normalized to the peak of the stacked line. A Gaussian fit to the line profile (dashed line) is shown together with the values derived for the line centroid and full width at half maximum.