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Fig. 5
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Spectrum of comet C/2020 F3 around the Li 6707 Å line. The observed spectrum (blue line) has been corrected (black line, shifted up by 0.05) for the sky contamination using the twilight spectrum (red line). The flux has been normalized to 1.4 × 10−11 erg cm−2 s−1 Å−1.
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