Integrated intensity (moment 0) maps of C¹⁸O, HCN, CN, C₂H, NO, and HCO⁺ emission in the HD 100546 disk. The top row presents the observations (Pérez et al. 2020; Wölfer et al. 2024; Booth et al. 2024) and the bottom row the predictions of the fiducial model. All intensities are in mJy km s⁻¹ beam⁻¹. The dotted grey ellipses indicate the dust rings seen in the high spatial resolution (inner ring) and in the moderate spatial resolution (outer ring) 0.9 mm continuum. The tickmarks on the panels are spaced by 1″, the horizontal bar in the bottom left panel indicates a 100 au scale. The HCN is shown on a logarithmic scale to highlight the weak outer ring and the modelled C₂H emission has been multiplied by a factor of 50. The beam of each of the observations is indicated with the white ellipse in the bottom left corner.