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Fig. 4

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Distribution of the non-thermal FWHM of the HCO+(4–3) molecular line toward ρ Oph-A. The star symbol marks the position of the Oph-S1 star. White contours show the continuum emission (Stokes-I) at 154 μm, with contours levels at 0.12, 0.2, 0.4, 0.6, and 0.8 Jy/arcsec2.

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