Today, the preprint of a new paper I co-authored appeared on the arXiv. I has the rather long title “The vast thin plane of M31 co-rotating dwarfs: an additional fossil signature of the M31 merger and of its considerable impact in the whole Local Group“, which summarizes its content pretty well. The lead-authors are François Hammer, Yanbin Yang and Sylvain Fouquet, whom I have recently visited in Paris. Have a look!