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Fig. 4

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Cross-correlation functions (CCFs) of the data and the best- fit models of 13CO for GQ Lup B (top) and GQ Lup A (bottom). The CCFs are shown in black, with the auto-correlation functions of the templates shown in brown and orange. The CCFs are calculated between the data residuals and the model residuals following the methodology from Zhang et al. (2021a) (also in de Regt et al. 2024).

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