σW vertical velocity dispersions for the old thin disc (black lines) and the young thick disc (green lines) at z = 0, 200, 400, and 600 pc. For the old thick disc (purple lines) at z = 0, 0.8, 1.6, and 2.4 kpc, σW does not change with z for the old thin disc or the young thick disc, but for the old thick disc, σW, and RσW increase with z.
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