Folded light curves in V′ of the monoperiodic variables of group 1 (SPB candidates). The mean V′ magnitude has been subtracted from the light curves. Cyan lines represent a sine fit to the data using the frequency found by the period search algorithm. The star identification is written in the lower left corner of each figure, with the mean V′ magnitude in parenthesis. The period used to fold the data is written in the lower right corner of each figure.