Related paper First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged particle pseudorapidity density at $\sqrt{s} = 900~$GeV Pseudo rapidity dependence of d$N_{\rm ch}$/d$\eta$ for INEL and NSD collisions. The ALICE measurements (squares) are compared to UA5 data (triangles) [3]. The errors shown are statistical only.[png]