  The splitting of elliptic flow measured in different regions of the momentum
space of produced hadrons has been recently studied in transport models and
proposed as a sensitive probe of the angular momentum carried by the fireball
produced in a relativistic heavy ion collision. The initial state angular
momentum also gives rise to rapidity odd directed flow which has been measured.
We consider a relativistic hydrodynamic framework with the initial matter
distribution suitably calibrated to describe the observed directed flow and
apply it to study the spilt in the elliptic flow. Our study suggests that the
split in the elliptic flow is mostly driven by directed and triangular flows
and may be used to constrain models of initial state rapidity distribution of
matter in the fireball.
