Measurement of the blue-shifted jet width and opening angle. Lower panels: intrinsic jet FWHM measured along the blue-shifted micro-jet, with the source position at the origin. Distance from the source is deprojected. The opening angle in each case is estimated by a fit to the lower bounds of the FWHM measured for the main peak at the observed knot positions. The plot in green corresponds to the overall width measured by fitting a single Gaussian across the jet and is therefore substantially wider where a bow shock is present in Hα. Upper panels: the corresponding deconvolved channel maps; contours begin at 3σ of the background noise and increase as a factor of .