The mean scatter curves for HT Cas, V2051 Oph, IP Peg and UX UMa were calculated using the 'single' method. A bin width of 0.01 in phase was used for all stars when calculating the smoothed light curve (see Sect. 2.2). Therefore, only flickering occurring on time scales below roughly 38#38 for HT Cas and V2051 Oph, 39#39 for IP Peg and 40#40 for UX UMa is seen.