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The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158AGeV In-In collisions. A strong excess of pairs is observed above the yieldexpected from neutral meson decays. The unprecedented sample size of close to400K events and the good mass resolution of about 2% have made it possible toisolate the excess by subtraction of the decay sources (keeping the $\rho$).The shape of the resulting mass spectrum exhibits considerable broadening, butessentially no shift in mass. The acceptance-corrected transverse-momentumspectra have a shape atypical for radial flow and show a significant massdependence, pointing to different sources in different mass regions.

NA60 results on $p_T$ spectra and the $\rho$ spectral function in In-In collisions