Frequency vs. Θ diagrams of the intensity variations of V795 Her determined by the PDM method (Stellingwerf 1978) for the individual segments abbreviated as S1 to S6 in Fig. 1c. The closer the value of Θ to zero, the more significant the frequency (i.e. period). The spectral window is marked by a dashed line. The arrow marks the best frequency attributed to f_sh (hence to 1/P_sh) in the top panel. See Sect. 3.2 for details. (This figure is available in color in electronic form.)