Distribution of the birthplaces of our CCs assuming they are born at the spiral arms and that the spiral pattern of our Galaxy has a fixed rotation period of 250 Myr. We have rotated the observed positions of our CCs by the angular difference during their lifetimes between the assumed spiral pattern speed and the Mróz et al. (2019) rotation curve at their corresponding Galactocentric radii. The symbols are the same as in Fig. 2. Individual error bars are indicated for each star (see the text for an explanation).