Fig. 4
From: Measuring the ionisation fraction in a jet from a massive protostar
Gaussian fitting to the jet width using the HST [Fe II] 1.644 μm continuum-subtracted image. Black data points are the data, red data points are the best Gaussian fit, and the blue dots are residuals from the fit. Best fit values for the jet width are indicated in the figure legend for the K2–K4 knots in panels (a)–(c), respectively
