Continuum-subtracted [O I]₆₃ maps of HH26 and HH34. The light green stars indicate the position of the jet driving sources HH26IRS, HH34IRS, and HH30IRS (coordinates from Table 1). The blue circle shows the FWHM spatial beam size in the blue channel of the FIFI-LS instrument. The golden boxes are the boundaries of the rectangular apertures, in which the fluxes F_63μm and F_145μm are measured (Table 4). Top panel: contour lines are drawn in magenta in logarithmic scale at three levels between (0.052–0.142) × 10⁻¹³ erg s⁻¹ cm⁻². Bottom panel: blue crosses label the position of the two knots E and L (between them lies the optical jet) and knot O (Heathcote & Reipurth 1992). Contour lines are drawn in magenta at two levels (0.105–0.125) × 10⁻¹³ erg s⁻¹ cm⁻².