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The Planck Early Release Compact Source Catalogue (ERCSC) includes nine listsof highly reliable sources, individually extracted at each of the nine Planckfrequency channels. To facilitate the study of the Planck sources, especiallytheir spectral behaviour across the radio/infrared frequencies, we provide a"bandmerged" catalogue of the ERCSC sources. This catalogue consists of 15191entries, with 79 sources detected in all nine frequency channels of Planck and6818 sources detected in only one channel. We describe the bandmergingalgorithm, including the various steps used to disentangle sources in confusedregions. The multi-frequency matching allows us to develop spectral energydistributions of sources between 30 and 857 GHz, in particular across the 100GHz band, where the energetically important CO J=1->0 line enters the Planckbandpass. We find ~3-5sigma evidence for contribution to the 100 GHz intensityfrom foreground CO along the line of sight to 147 sources with |b|>30 deg. Themedian excess contribution is 4.5+/-0.9 percent of their measured 100 GHz fluxdensity which cannot be explained by calibration or beam uncertainties. Thistranslates to 0.5+/-0.1 K km s^{-1} of CO which must be clumped on the scale ofthe Planck 100 GHz beam, i.e., ~10 arcmin. If this is due to a population oflow mass (~15 Msun) molecular gas clumps, the total mass in these clumps may bemore than 2000 Msun. Further, high-spatial-resolution, ground-basedobservations of the high-latitude sky will help shed light on the origin ofthis diffuse, clumpy CO emission.

The bandmerged Planck Early Release Compact Source Catalogue: Probing sub-structure in the molecular gas at high Galactic latitude