Fig. 5
Detailed line shape of Ca ii 8662 Å line. Top panel: the limb and centre spectra from the Kitt Peak Solar Atlas. Middle panel: the ratio of the limb to centre Kitt Peak spectrum. The green line is same data convolved to 1 Å resolution. Bottom panel: the ratio of the penumbra to bright Moon spectrum from CFHT lunar eclipse data (the same data set as shown in Fig 4a).
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