Fig. 3
Spectral groups obtained with analysis of 3σ (left) and 2σ (right) for 8300 NIRS3 spectra of July 11, 2018 (a and b), for 13385 NIRS3 spectra of July 19, 2018 (c and d), and 16528 NIRS3 spectra of October 30, 2018 (e and f). The observations were carried out at different phase angles: 18.2° for July 11; 17.5–17.8° for July 19; and 7.6–7.8° for October 30, 2018.
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