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Fig. 6
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Emission line ratios that trace shock velocities in the inner jet regions. No extinction correction has been applied, as the [O I]λλ63QQ,6363, [S II]λλ6716,6731 and Hα lines are close in wavelength, and we used the Hα/Hβ ratio to estimate the extinction (Sect. 4.2). The source position is marked by the dashed green line.
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