Symbols: 1-min average line profiles at Point C with error bars (standard deviation of the 20 individual measurements), taken 5 min before the reference spectrum in Fig. 1 (17:09 UT). At this time, the satellite lines in O iv are particularly strong. Solid line: average spectrum outside the spot. The main and satellite lines all have similar line widths (FWHM ~ 30 km s^-1), with the exception of Si iv 1403 Å, which has a significantly narrower main component. The satellites are less pronounced in Si iv than in O iv.