Positions of seven new H-rich central stars (red symbols with error bars) in the Kiel diagram together with other H-rich objects. The blue symbols denote the strongest post-RGB, post-CE central star candidates known to date (Jones et al. 2023). H-rich central stars of PNe are shown as open circles, and ‘naked’ (i.e. with no PN) O(H)-type stars as filled circles. Evolutionary tracks for post-AGB remnants (solid lines) by Miller Bertolami (2016) and for post-RGB remnants (dashed lines) by Hall et al. (2013) are labelled with the stellar mass in solar units. This is an updated plot from Reindl et al. (2016) (see references in the caption of their Fig. 3), Jones et al. (2022) (see their Fig. 6), and Jones et al. (2023).