Fig. 1.
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Model for the Ca II triplet lines in the synthetic scattered integrated starlight (ISL) spectrum (black line) for an assumed continuum intensity of 15 units and a spectral resolution of 10 Å; the Pickles spectrum library has been adopted (Lehtinen & Mattila 2013). The dashed red line shows the on–off spectrum (opaque dark core minus transparent background sky) in the presence of an EBL of 5 units.
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