Comparative view of with varyingdisk temperature h. Disk orientation is taken consistent with values found in the literature on HD 142527 (i = 27 ° Fukagawa et al. 2013, PA = 71° Kataoka et al. 2016). A mock-up of a spectral resolution of 12.5 m s⁻¹ is shown. The reference setup occupies the leftmost panel. Velocities in the cavity are masked as in Fig. 8. In dashed lines, the best fit spirals following (Huang et al. 2019; Eq. (2) therein) are overplotted, based on linear perturbation theory (Goldreich & Tremaine 1979; Rafikov 2002; Muto et al. 2012). Those fits were computed using v_r = 0 contours as input data. As a visual indicator, surface density is underplotted in grayscale. Additionally, gray circles indicate the 3σ_j region around the vortex eye, which is used later in Fig. 10. As in other figures, the black cross indicates the density maximum.