Fourier-fitted synthetic light curves of all 37 data segments analyzed in this paper. The primary minima are shifted to zero phase. The time series are ordered on the basis of the closest neighbor, as described in Sect. 2. The pre-selected templates are shown by distinct colors. Following the notation of Table 1, the green, yellow, and magenta lines show the Fourier fits corresponding to segments Kepler-4, AAVSO-V-1, and AAVSO-V-4, respectively.