Left: Log scale plot of the derived water column density around the nucleus of 67P. Color-coded scale in log(molec cm^-2 ) is given at the right. Right: values of the peak velocity of the HO line (from Gaussian-fitting the strongest component). Negative velocities, seen against the nucleus from lines in absorption, indicate a flow towards the observer. Off the nucleus, the line is mostly redshifted (positive velocities) as a result of self-absorption of the foreground part of the coma in the optically thick HO line, which causes gas moving away from us on the far side of the nucleus to dominate the spectrum. Contours of the continuum level (in black), locating the nucleus, are superimposed. The direction of the Sun and north pole rotation axis are also shown.