Individual night series of V795 Her in relative intensity units. For each night, the upper panel represents the observed V-band data (panels a), d), g), j), m)). A solid line represents the HEC13 fit. Residuals of this fit, RIS, are given in the middle panel of that night (panels b), e), h), k), n)). Moving averages of the standard deviation of these residuals, σ_IR, are plotted in the bottom panel of the night (panels c), f), i), l), o)). The vertical dashed and dotted lines mark Φ_sh = 0.0 and Φ_sh = 0.5. The ephemeris for S3 (Table 2) was used for panels m), n), o). The quantities Φ_sh in the remaining panels were calculated according to the ephemeris for S1 (Table 2). See Sect. 4.2 for details.