Left panels: continuum and line peak flux density vs. time (up) and peak velocity vs. time (bottom) for the spectra with a channel spacing of 2.4 km s^-1. The peak flux density of the line has been multiplied by a factor of 100 to allow the comparison with the continuum flux density within the same plot. The error bars represent the rms noise levels per channel of the spectra and the width of the channels, respectively. Right panels: continuum and integrated flux density vs. time (up) and peak velocity vs. time (bottom) derived from Gaussian fitting. The error bars indicate the formal errors obtained from the fits. Best fit lines and mean absolute deviations are shown in blue. Day 0 is 2008 October 14–15.