Comparison between the observed and simulated dark satellite distribution lying in projection beyond the outer HI disk of M33, averaged in 60° sectors. The observed distribution is from Grossi et al. (2008). The pie to the left summarises the average distribution of satellites in the various sectors for several simulated orbits of M33 with a close pericentre passage around M31 in the past. The percentages refer to the fraction of satellites observed or predicted in each angular sector.