First Cosmic muon seen in four barrel muon stations at point 5 on 13 December 2005

One of the 400k cosmic muons recorded for the first time on 13 December 2005 in four stations of the CMS barrel muon system at point 5 in Cessy. In the transverse r-phi view each station records the position of the muon in two super-layers of drift tubes giving 8 points per station. The muon track is then reconstructed with 32 points in the r-phi view visible in the picture and 24 points in the r-theta orthogonal projection.