Figure 4

The π⁺π^- acceptance-corrected invariant-mass distribution. The line represent the best fit of the Söding form to the data in the range 0.65 <M _ππ < 1.1 GeV. The vertical lines indicate the range of masses used for the analysis. The dashed line is the shape of a relativistic Breit-Wigner with the fitted parameters given in the figure. The dotted line is the interference term between the non-resonant background (dash-dotted line) and the ρ⁰ signal.