Infalling streamline model for the two IRAS04302 streamers. Top: Streamline models, plotted in green, on top of the moment-1 map of CO, spatially matching the observed streamer emission to both the south and north (outlined in the green polygons). Middle and bottom: Velocity components of CO taken from inside the south and north green polygons, respectively,plotted as a function of projected distance from the central young stellar object, with varying levels of kernel density estimation of the velocity plotted as filled contours and contours calculated as in Fig. B.1. The streamline models are shown in green. For the southern streamer, the CO emission is entirely described by the streamline model. For the northern streamer, the streamline model corresponds well with the emission at radii less than 400 au, but the model over-predicts the velocity at larger radii, hinting at a more complex velocity field in this system.