Integration bands and derived excess light curve. Left: gray shaded areas show the integration bands with passband of 1 Å, 1.5 Å, and 3 Å, centered at the core of each sodium line. The red and blue intervals show the passbands of the reference bands for D2 and D1, respectively. Right: the raw excess light curve shown with the red circles for the 1.5 Å integration band inside the sodium D2 line. Dashed vertical lines indicate times of ingress and egress.
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