Dynamic spectra S₁(t, ν) from three observations of PSR B0329+54 (upper three panels) and their autocorrelation functions A(Δ t, Δν) (panels in the lowest row). Some dummy points caused by the interference are set as S₁ (t, ν)= 0. Observationtime (in MJD) and pulsar name are indicated above each plot. The autocorrelation functions are plotted against time lag Δt in minutes and frequency lag Δν in MHz. The two-dimensional Gaussian functions are fitted to the main peaks of the autocorrelation functions to derive the scintillation parameters. In the side-panels only data for the cross-sections are shown by “x” (too many for this pulsar mean that they look as if they were a thick line, butnot so many for the other pulsars shown in other figures) and the fitted lines at Δ t = 0 and Δ ν= 0 are drawn. The color schemes are indicated by the wedges for both the dynamic spectra and autocorrelation functions, which are saturated at − 10% and 60% of the peak values (with exceptions for other pulsars, but these are especially marked).