Velocity-integrated emission of the SiO jet driven by VLA15. The colour images are for intensities higher than 3σ with σ = 4.8 mJy beam⁻¹ km s⁻¹. The cut positions at which the widths were measured are shown with white horizontal lines. The knot positions at which the dynamical ages are estimated are shown with arrows and are labelled in white. VLA15 is depicted with a magenta star and labelled in white. The synthesised beam is depicted in the lower left corner.