Left: CO ALMA spectrum at 345.7960 GHz for observation #313 at the disk center (black solid line) on November 14, 2011. We over-plotted a synthetic spectrum (red dotted line) obtained using the nominal CO profile of Fig. 5 (orange line) and the retrieved temperature profile (red solid line) on the right panel. Right: Retrieved temperature profile (red solid line) as function of altitude. VIRA day side temperature profile (black dotted line) used as a priori is also displayed.