Photometry. Upper panel: combined SuperWASP-N and WASP-South discovery light curve for WASP-71b, folded on the orbital period of P = 2.9036747   d. The small, light-grey points are the un-binned data and the larger blue points are binned in phase, with a bin width equivalent to 120 s. Lower panel: high-precision transit photometry from TRAPPIST, over-plotted with our best-fitting models (solid lines). In each case the un-binned data are shown in small, light-grey points, with residuals to the best-fitting model shown below. Data binned on 120 s are indicated with orange circles for the transit of 2011 September 27 (upper) and green squares for the transit of 2011 September 30 (lower), which is offset in flux for clarity. The phase at which the meridian flip occurred during the latter transit is indicated by a blue arrow.