HD (J = 1–0) spectrum toward Jupiter’s center, with best-fit models overlaid. The velocity scale refers to the Jovian system baryceter. Top: HD (J = 1–0) (black line and gray-filled histogram) and modeled Voigt profiles with pressure shift (red) and without (blue, the dashed profile is for a $-4_{.}^{\mathrm{\prime }\mathrm{\prime }}2$ pointing offset). Residuals and their normalized χ² values (in brackets for the offset pointing) are shown atop (in corresponding colors, with ordinate shifts for clarity). Note the less-suppressed bandpass ripples located on the wings of the absorption profile, as discussed in section 3. Bottom: as above, but comparing the speed-dependent with the pressure-shifted Voigt profile (blue, respectively red).