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Fig. 3

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Measured passbands (grey dashed lines) of the Lyot filter used for ChroTel Hα observations. The zero point marks the minimum of the Hα line at 6562.8 Å. Top: filter passband without contrast element. Bottom: filter passband with contrast element. For comparison, a spectrum around the Hα line is overplotted (solid lines, recorded with the spectrograph of the Schauinsland Observatory).

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