(a) Profile of the intensity. (b) Corresponding 2-TCF. The arrow running from the bottom left to the top right corner denotes the observation time. The delay time directions according to the CCS and ACS for an observation time tobs = 100 are indicated by the small arrows close to the bottom left corner. The small squares along the observation time correspond to observation times 284 (red), 610 (green) and 895 (cyan). The colour bar scale shows the degree of correlation.