Residuals of a particular event from B, FRB20190519B, using best-fit parameters. Left-hand side: CHIME/FRB dynamic spectrum (middle), intensity curve (top), and spectrum (left). The one-Ω envelope (or emission angle iso-contour) of the emission beam is shown in blue, with a dashed purple line showing its characteristic frequency as a function of time. The vertical dashed red lines mark the injection time for each sub-burst. In the spectrum and intensity plots the blue lines represent the data, and the orange lines the model. Right-hand side: Same but showing the residuals between the data and the model.