Fig. 1

Variation in jet width (FWHM) derived from [SII] and [OI] images as a function of distance from the source. Data points are from CFHT/PUEO and HST/STIS observations of DG Tau (diamonds), HN Tau (plus signs), CW Tau (squares), UZ Tau E (crosses), RW Aur (circles), HH 34 (one triangle). Data are taken from Ray et al. (2007) for distances below 200 AU and Dougados et al. (2000) beyond this distance.
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