Fig. 1
Transmission of the VISIR filters used for the observations of Betelgeuse. The transmission of the J7.9 filter is supposed to be Gaussian with a central wavelength of 7.76 μm and a half-band width of 0.55 μm. The ISO spectrum of Betelgeuse is also shown for reference, with an arbitrary intensity scale (thin grey curve, see Sect. 3.2 for details). The central wavelength of each filter is given in the legend.
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