Colour–colour diagram based on WISE data. The grey dots are point sources seen projected against all clouds in the MBM catalogue. Most in the swarm have the colours of (spiral) galaxies, while stars and elliptical galaxies have colours near zero. The diamonds identify the candidate Hα emission-line stars found in our grism field (Table 1), with upper limits indicated by upside-down triangles. For comparison, the circles indicate the YSOs found in MBM12 (Luhman 2001).