Spectrum of the ionisation nebula of CAL 83 taken from our 25.5′′ × 25.5′′ (7.5 × 7.5 pc2) FoV, excluding the contribution from the three stars (2 field stars and CAL 83). The spectra were extracted from 1213 and 1233 spaxels for the blue and red part of the spectrum, so the area from which the spectra are extracted differs between the blue and the orange observations. Note that the spectra are not dereddened.
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