Example observations of QQ Vir from February 20, 21, and 22, 2012 at the Monet telescope (top three panels), and V541 Hya from February 6, 7, and 12, 2008 at the SAAO (bottom three panels), combined used as one O–C measurement each. The error bar on the left of each plot represents the photometric uncertainty. The red line shows the simultaneous three and two frequency fit to the epoch data, repsectively.
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