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Fig. 6
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HL Tau disk velocity structure analysis. A Keplerian disk model (c and d) is subtracted from the observed HCO+ and H2CO moment-1 maps (a and b, from Yen et al. 2019; Garufi et al. 2021), yielding the velocity residuals of (e) and (f). For both HCO+ and H2CO, outside of the disk radius the vsys is subtracted.
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