Model fitting to the Hα jet flux profile (grey) without scattered emission subtraction. The source peak is fitted with a Moffat function and knot peaks are fitted with Gaussian profiles. Top left: Initial and best-fit models compared with the data. Top right: Components of the best-fit model. Lower left: Comparison of the best fit model and data after the fitted source peak is subtracted, highlighting the model residuals. Lower right: Data after the source peak is subtracted, overlaid with the remaining model components (the knot peaks).