XMM/Newton MOS1 image of DS Tuc. The two red points indicate the ICRS positions of the two stars from SIMBAD, the centroid of X-ray emission is offset because of the proper motions of the system. The contours show the emission of the two sources, marginally resolved. The large circle (in red) has 30′′ radius, while the smaller circles (in yellow) are 10′′ wide. They were used to extract the spectra and light curves of the A and B system components (see text).