Fig. 1

Dithering pattern used during the near-infrared observations. The image shows the 2.4′ × 2.4′ FOV of the ANDICAM near-infrared camera, attached to the 1.3 m telescope of the SMARTS Consortium. The target (WASP-121=2MASS 07102406-3905506) is in the middle, the comparison star 2MASS 07102364-3905561 is in the lower left corner. North is up and west is to the left. Circles around the target and the comparison star show the aperture sizes used to estimate the stellar and background fluxes.
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