  We provide a method to correct the observed azimuthal anisotropy in heavy-ion
collisions for the event plane resolution in a wide centrality bin. This new
procedure is especially useful for rare particles, such as Omega baryons and
J/psi mesons, which are difficult to measure in small intervals of centrality.
Based on a Monte Carlo calculation with simulated v_2 and multiplicity, we show
that some of the commonly used methods have a bias of up to 15%.

Data Analysis, Statistics and Probability;Nuclear Experiment