Kinematical thick disk-to-thin disk probability ratio (TD/D) versus metallicity for the ~14 000 stars in the GCS. Stars with TD/D > 2 are, to a first approximation, classified as potential thick disk stars, and stars with TD/D < 0.5 are, to a first approximation, classified as potential thin disk stars. Stars with probability ratios between these two limits are here classified as “in-between stars”. The metallicities, [M/H], are from the Strömgren calibration by Casagrande et al. (2011).