  We calculate pseudoscalar masses on gauge configurations containing the
effects of 2+1 flavors of dynamical asqtad quarks and quenched
electromagnetism. The lattice spacings vary from 0.12 to 0.06 fm. The masses
are fit with staggered chiral perturbation theory including NLO electromagnetic
terms. We attempt to extract the fit parameters for the electromagnetic
contributions, while taking into account the finite volume effects, and
extrapolate them to the physical limit.
