The Mock LISA Data Challenges: from challenge 3 to challenge 4

S Babak, JG Baker, MJ Benacquista, NJ Cornish, SL Larson, I Mandel, ST McWilliams, A Petiteau, EK Porter, EL Robinson, M Vallisneri, Alberto Vecchio, M Adams, KA Arnaud, A Blaut, M Bridges, M Cohen, C Cutler, F Feroz, JR GairP Graff, M Hobson, JS Key, A Krolak, A Lasenby, R Prix, Y Shang, M Trias, J Veitch, JT Whelan