A study of áv2？ with NeXSPheRIO

elliptic flow at rhic is computed event by event with nexspherio. reasonable agreement with experimental data on v2(h) and v2(pt) is obtained. various effects are studied as well: equation of state (with or without critical point), emission mechanism (cooper-frye prescription or continuous emission), type of the initial conditions (average or fluctuating initial conditions).