Total emission spectra and integrated intensity maps of the eigth NaCl transitions detected in this work (lable 2). Robust weigthing has been used to restore the emission maps with a half-power clean beam width of HPBW=0″.02×0″.02. Contours are 2σ, 3σ, 4σ, … with σ=4.6, 4.3, 4.4, 3.9, 3.5, 3.8, 3.7, and 2.9 mJy beam⁻¹, for the maps from left to right and top to bottom. Maps are rotated by 25° clockwise so the symmetry axis of the nebula is vertical.