Observed (i.e. not corrected for extinction) integrated flux of selected lines in the jet velocity range: −300 <   ν   < −75 km s^-1 (blue) and 75 <   ν   < 300 km s^-1 (red) for HH 1042; −300 <   ν   < −30 km s^-1 (blue) and 30 <   ν   < 300 km s^-1 (red) for HH 1043. Note the overlap of the two slit positions; the on-source emission profiles in the blue and red lobes trace different parts of the flow. Only emission above the average 3σ noise level is shown. Note the different locations of the peaks and trends in intensity for e.g. the [Fe ii] and He i lines.