Analysis of the X-shooter images. Top: examples of the [O III]λ4959 emission line as observed in the 2D raw frames. The bright spots correspond to the line structures (i.e., peaks) in the Fig. 3 profile. The wavelength increases from left to right. Bottom: X-shooter acquisition frame. The blue square encloses Cen, while the red ones cover the comparison stars that were used to estimate the seeing PSF. The field shown is 1.47 arcmin squared.