tokens: This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. We have also used UKIDSS data from the UKIDSSDR8plus database. The UKIDSS project is defined in Lawrence et al. (2007) . UKIDSS uses the UKIRT Wide Field Camera (WFCAM; Casali et al. 2007 ) and a photometric system described in Hewett et al. (2006) . We thank R. M. Humphreys for her comments on an early version of the paper and N. L. J. Cox for his advice on DIBs.
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