The Atacama Cosmology Telescope: cross correlation with Planck maps - Louis, T; Addison, G; Hasselfield, M; Bond, JR; Calabrese, E; Das, S; Devlin, M; Dunkley, J; Duenner, R; Gralla, M; Hajian, A; Hincks, A; et al. (JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2014)