Example of background correction with Earth’s presence and with bright sources in the field of view. Top left: raw shadowgram in counts (20 s exposure). Top right: sky map with the Earth and the corrected sources (Sco X-1, GX 349+2, GX 3+1, 4U 1705-440, GX 9+9). Middle left: fitted model of the shadowgram (2D polynomial and illumination functions of sources). Middle right: wavelet model of the shadowgram (D₃) combined with fitted model of the sources. Bottom left: shadowgram corrected with the fit method. Bottom right: shadowgram corrected with the wavelet method.