Synthetic ¹²CO v(1−0)P26 (4.9204 µm) line profiles of the circumstellar disk (blue) and circumplanetary disk (red) from the PRODIMO radiative transfer. The combined and degraded signal corresponds to the spectral resolution of the CRIRES observations performed by Brittain et al. (2014, 2019) during multi-epoch monitoring of the HD 100546 system. The light shaded red region indicates the contribution of the CPD.