Periodogram of the available stellar photometric data (SuperWASP) and the folded light curves, with the adopted stellar rotation periods marked by pointers. Periods with a power in excess of 30 occur with a rate of less than 1 in 10 000 by chance. Substructure of major period peaks is caused by period or phase shifts between different observing seasons. The 1 d period is prominent in all periodograms.