A highly non-Keplerian protoplanetary disc - Spiral structure in the gas disc of CQ Tau

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Fig. 4

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Residuals of the ¹²CO brightness temperature after subtraction of an azimuthally averaged radial profile. Two spirals Sp_T1 and Sp_T2 are spanningan azimuth of ~100° and >180° respectively between ~10 and 180 au.

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