Chromospheric emission from the loop that is rooted in the umbra. The left panel shows a raster map (obtained from 09:37 UT to 09:43 UT) in the red wing of Mg ii k 2796 Å line integrated from 70 km s^-1 to 120 km s^-1 redshift showing mainly the cool component of the downflowing plasma. The field of view is the same as in Fig. 2 and is indicated by the red rectangle in Fig. 1c. North is left. The right panel shows the Mg ii k line profiles at the two positions marked in the left panel (the solid line corresponds to the position indicated by the square, the dashed line to the triangle). The wavelength is given in Doppler shift units. See Sect. 3.3.