Planck 2015 results. IV. Low Frequency Instrument beams and window functions

P.A.R Ade, N. Aghanim, M. Ashdown, J. Aumont, C. Baccigalupi, A.J. Banday, R.B. Barreiro, N. Bartolo, E. Battaner, K. Benabed, Per Rex Christensen, Anne Mette Frejsel, Pavel Nasselski, Igor Dmitrievich Novikov, Hans Ulrik Nørgaard-Nielsen