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In this letter we will argue that the event-by-event fluctuations of theratio of positively over negatively charged pions provides a measurements ofthe number of rho and omega mesons right after hadronization. This finding canbe utilized to put the hypothesis of chemical equilibration in relativisticheavy ion collisions to a test.Comment: 4 pages. No figure. Uses revtex with prl, aps, and multicol style

Fluctuations of Particle Ratios and the Abundance of Hadronic Resonances