Upper: spatial profiles of comeasured H₂O (blue) and HCN (orange) emissions and continuum (dashed) in E3 from the L-Custom setting. Color-coded 1σ uncertainties are shown for the profile of each species. The slit was oriented along the projected Sun–comet line (position angle 88°), with the Sun-facing direction to the left as indicated. Also shown is the Sun–comet–Earth angle (phase angle, φ) of 48°. “Smooth” indicates the width (pixels) of a boxcar smoothing kernel applied to HCN. Lower: spatial profiles of comeasured H₂O and HCN emissions and continuum in E3 with the slit oriented perpendicular to the projected Sun–comet line (position angle 178°).