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Fig. 3

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Noise analysis of the residuals to the spectrophotometric light curves shown in Figs. 6 and 7 for data from GMOS (left) and MOSFIRE (right). Top: decrease in RMS of binned residuals with increasing binned size. The solid curves correspond to the individual wavelength channels, and the dashed line shows the 1/ expectation for independent and uncorrelated errors. The vertical dotted line indicates T12, the duration of transit ingress. Middle: discrete autocorrelation of the residuals. Bottom: power spectral density of the residuals. The GMOS data exhibit strong internal correlations on 1-hour timescales, while the MOSFIRE data exhibit much weaker correlations.

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