  We compare v2/{\epsilon}2 and v3/{\epsilon}3 from single-shot and
event-by-event (2+1)-dimensional hydrodynamic calculations and discuss the
validity of using single-shot calculations as substitutes for event-by-event
calculations. Further we present a proof- of-concept calculation demonstrating
that v2 and v3 together can be used to strongly reduce initial condition
ambiguities.
