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Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach.\n  Methods: The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods.\n  Resu","authors_text":"C. Liebig, C. Snodgrass, D. Nesvorn\\'y, D. Ricci, E. Kerins, F. Finet, F. Sch\\\"onebeck, G. Scarpetta, H. Kjeldsen, J. Skottfelt, J. Southworth, J. Surdej, J. Tregloan-Reed, K. A. Alsubai, K. B. W. Harps{\\o}e, K. C. Sahu, L. Mancini, M. Dominik, M. Hundertmark, M. J. Burgdorf, M. Lundkvist, M. Mathiasen, M. N. Lund, M. T. Penny, N. Kains, N. Nikolov, O. Wertz, P. Browne, P. Dodds, S. Calchi Novati, S. Hardis, S.-H. Gu, S. Proft, S. Rahvar, S. Sch\\\"afer, T. C. Hinse, T. Gerner, U. G. 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