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Fig. 4

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The O − C diagram for the ephemeris calculated from all known mid-transit times of OGLE2-TR-L9 b. In the upper panel, all points are shown, while the lower two panels zoom in on the new points together with the point found from the transit in 2008 (middle panel) and solely the new points (lower panel). The mid-transit points of the epochs 0 and 179 occur 1.5 min later and 1.0 min earlier than expected, respectively.

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