Left: jet FWHM derived from Gaussian fits to deconvolved [Fe ii] channel maps as a function of projected angular distance from the star. Right: PSF corrected (i.e. intrinsic) jet radii as a function of linear distance from the star for the inner 08 of the HVB (solid curves) and MVB (dashed curves). The fitted FWHM across the jet were corrected for the angular resolution of 005–008 in the deconvolved maps by subtracting this PSF in quadrature. Gray/green solid lines show fits by a flow of constant opening angle, suggesting a launch radius smaller than 4 AU (HVB) and 1 AU (MVB). For comparison, open symbols plot jet radii measured in [O i] images integrated over all velocities in DG Tau (open squares Dougados et al. 2000), RW Aur (open stars Woitas et al. 2002), and HN and UZ Tau E (open circles and triangles Hartigan et al. 2004a).