Power density spectrum smoothed with a 4-point boxcar function (in units of ppm²/μHz) estimated from a time series of 24 days of VIRGO/SPM masked with a mask of CoRoT with a duty cycle of 70%. The black curve corresponds to the original PDS estimated from the complete data. In the top panel, the blue curve corresponds to the PDS calculated with a least-squares sinewave fit on the incomplete data. Bottom panel, the red curve correspond to the PDS estimated using a fast Fourier transform on the inpainted data.