Fig. A.1
Photometric periodogram, and photometric light curves for SDSS0853+0720, SDSS 2243+3122, SDSS 1611+4640 and SDSS 2112+1014 phase folded with the orbital period corresponding to the highest peak in the periodogram (bottom panels), Porb = 0.1503 d, Porb = 0.11954 d, Porb = 0.0823 d and Porb = 0.0923 d respectively. Double-sine fits are shown in red.
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