Addendum 2 to the COMPASS Proposal

In this Addendum a request is presented for two years (2x150 days) of muon data taking, one year with a transversely polarised proton target and one year with a longitudinally polarised proton target. The proposed measurements complete the initial data taking with a proton target which took place in 2007. Only minor modifications and improvements of the apparatus with respect to 2007 are planned. The measurements should start in 2010 with the transverse part.