Distribution of α-element abundances with [Fe/H] for stars observed in the field of NGC4815. Stars with radial velocities within 4 km s^-1 of the cluster mean are considered members and denoted with solid circles; stars with velocities that deviate by up to 10 km s^-1 are denoted by open circles; stars with velocities more then 10 km s^-1 from the cluster mean are denoted by crosses.