BRITE photometry of Capella. Panel a: full data set. The top light curve is the red BTr data (red dots); the bottom light curve is the blue BLb data (blue dots). The insert identifies the magnitude shifts applied to each individual CCD setup per satellite. Panel b: periodograms of the red data. The top (blue) line is from the PDM given in units of its normalized variance; the bottom (black) line is the generalized LS (GLS) given in units of . The vertical dashed lines are the periods identified (see text). Panel c: periodograms of the blue data, otherwise as in panel b. Panel d: phase plots for the red data (red dots, top curve) and blue data (blue dots, bottom curve) with the best-fit 10.10 d period. Phases outside ± 0.5 are just repeated.