Radial scale length Rd of the thick disc versus metallicity. Considered are SEGUE thick disc stars with 7.5 kpc < R < 8.5 kpc, 4195 in total. Red points show the radial scale lengths calculated for each metallicity bin with the “effective” quantities in Eq. (9). The points are fitted with a constant and also with Rd linearly dependent on [Fe/H] (solid and dashed lines). One-sigma areas are shown in grey. The blue point corresponds to the value of scale length derived in case of binning the same sample in 4 |z|-bins.
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