Fig. 16
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Intrinsic spectra of HD 209458 in epoch 1, showing the sodium doublet from occulted regions of the photosphere. The purple (from end of ingress) and red (from beginning of egress) spectra trace HD 209458b moving from the blueshifted to the redshifted stellar hemisphere along its aligned orbit (spectra are downsampled for clarity, with original data shown as faded profiles).
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