Epoch photometry (left), derived periodograms (left centre), phase-folded light curves (right centre), and residuals (right) for previously known binaries classified as VARIABLE by Gaia. Red ticks on the periodograms indicate the highest peak, and horizontal dashed lines are false-alarm levels at (from low to high) 10%, 1%, and 0.1%. Powers are normalised relative to the residuals of a constant model and lie between 0 (no improvement over constant model) and 1 (periodic model has zero residuals). Error bars are 2σ errors for visibility. An additional half-phase is shown for the light curves and residuals. The light curve and residuals for Abell 41 are folded at double the derived period (see text).