Measurements by J.-M. Malherbe. Red curve: transmission profile of his Δλ = 40 pm bandwidth filter. For our calibrations we enlarged this profile to match the Δλ = 50 pm bandwidth profile of our filter from the same manufacturer (Daystar). We convolve the solar spectrum with this profile. The dotted line represents the central part of the Hα line in the solar spectrum, not normalized in this figure.
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