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Fig. A.3


Comparison in flux density and in TB scales (TB/Fν = 482.609 K Jy-1) between the 13CH3OH(121,11–120,12)A spectrum extracted at ±006 from the protostar (see Fig. 2: blue- and redshifted emission towards north-west and south-east, respectively) in the direction along the equatorial plane (i.e. disc plane; Lee et al. 2017). The vertical dashed line stands for the systemic VLSR velocity (+1.7 km s-1, Lee et al. 2014).

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