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Table 2.

CHROMIS filters.

Wide-band filters
Narrow-band prefilters
Wavelength band CWL [nm] FWHM [nm] Tpeak Wavelength band CWL [nm] FWHM [nm] Tpeak
Ca II K blue 392.52 0.41 0.86
Ca II H&K WB 395 1.32 0.9 Ca II K core 393.41 0.41 0.8
Ca II H red limb WB 396.96 0.18 0.74 Ca II H core 396.88 0.41 0.8
Ca II H core limb WB 396.90 0.18 0.71 Ca II H red 397.74 0.41 0.83
Ca II continuum 399.04 0.42 0.76
H-β WB 484.55 0.65 0.9 H-β NB 486.22 0.48 0.92

Notes. CWL = center wavelength at normal incidence, Tpeak = peak transmission as given by the manufacturer. See also the measured transmission profiles in Fig. 4. The curly brackets indicate that any of the Ca II WB filters can be combined with any subset of the Ca II NB prefilters.

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