Merged position–velocity diagrams of three individual lines traced with colors. Top: HH 1042; the stellar continuum of 08576nr292 (at 0″) was subtracted using a Gaussian fit. Bottom: HH 1043; no continuum removal was performed. Note the prominent emission of high excitation species (He i, [S iii]) in the shock regions where the velocity drops. The [O i] line peaks on-source, where the ejection mechanism operates, and in the shock regions.
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