Fig. A.1
Verification of the narrowband properties of the filtered spectral intensity. Panel a: filter function in the visible range taken from Bessell (1990) and the corresponding narrowband average: 
, 
Vσ; panel b: spectral intensity for air computed from Specair (Laux 2002) and the corresponding narrowband average: 
, 
Iσ; panel c: narrowband spectral intensity in the visible range; comparison of both side in Eq. (A.4): 
, 
.
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