Mass distributions of selected dileptons for the dielectron (upper left) and dimuon (upper right) samples for the central analysis and dimuon samples for the semi-forward (lower left) and semi-backward (lower right) analyses. In all cases the data are represented by points with error bars The solid blue line is a fit to a Crystal-Ball function plus an exponential distribution, where this last contribution is shown by a dotted red line. | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/4554/mass_el_pub-100224.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/4554/mass_mu_pub-100226.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/4554/mass_pPb_pub-100228.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/4554/mass_Pbp_pub-100235.png ) |