Spectra of SiO 5−4 (red) and CO 2−1 (black), and their intensity ratios SiO 5−4/CO 2−1 (blue diamonds) at the position of the HV blue- (top) and redshifted (bottom) jet knots, B′ and R′. The profiles are normalized to the CO peak intensity (normalization factor is labeled). Horizonthal and vertical dashed lines mark the baseline and the systemic velocity, Vsys = + 2.7 km s-1 and the vertical dotted lines the ±5 km s-1 interval where extended CO emission is filtered out.
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