Production rates per solid angle derived for each point versus their angular position in the plane of sky relative to the direction of the Sun. For measurements against the nucleus, we have determined a rough position angle between the plane containing the targeted point (assumed to be at 2 km from the center) and the terminator and the plane of the sky. These nadir-directed points are shown as light squares. There is a clear peak in emission between angles of –100 and +60°, forming a broad jet from a region on the nucleus including the subsolar point and the north pole. Independent Gaussian fits to the HO and HO data are plotted as dotted lines. The vertical scale for HO has been multiplied by 125 relative to HO for legibility, but we would expect a factor ≈4 more (matching the expected ¹⁶O/¹⁸O ratio of 500) with a better modeled opacity. The HO production rates (blue dots and squares) are very likely underestimated because the line is not fully modeled due to saturation (Fig. 4-(1)) in the region –70 to 0°, which explains the broader angular shape. Nadir points (squares) suggest that the jet probably is narrower in the plane of the line of sight and Sun direction.