Intensity and velocity maps of Mg x 625 Å obtained by the sit-and-stared SUMER observations. Contours of Fe x 184 Å are plotted on both maps. The area that is marked by the red arrow corresponds to region b in the moss area (defined in the left panel of Fig. 6). The average Doppler velocity of Mg x 625 Å is of −6.6 km s^-1 inside region b and of (− 5.50  ±  0.55) km s^-1 over the whole area shown here.