Toomre diagram for our CN-strong giants (colored circles) and the Galactic GC population (blue squares). The latter is only shown in the regime −1.8 <  [Fe/H] <  −1.3 dex, representing the coverage of the analyzed stars. The color coding of the CN-strong stars is the same as in Fig. 4. For better comparability, an additional Gaussian kernel density estimate of the GC sample is provided where increasing color darkness resembles increasing density. To show the clear contrast to the Galactic disk population, we also indicate all targets from our Gaia – SDSS crossmatch that obey −5° < b <  5° and have a spectrophotometric distance as determined by SDSS of less than 1 kpc (gray dots). Moreover, the dashed line encircles the region of absolute velocities of less than 100 km s⁻¹ with respect to the local standard of rest.