Illustration of a one-sided patch of switchbacks. Top panel: radial and tangential component of the magnetic field, B_R and B_T, as well as the expected components of the Parker spiral magnetic field. The difference between model and data is lightly shaded. In the bottom panels, we plot the 2D distributions f(B_R, B_T) and f(B_R, B_N); the color scale indicates the number of points inside each bin.