MDF of the model (without the APOGEE distance distribution applied) for the fields outlined with a dashed line in Fig. 9, where the field is indicated in the top-right corner of each panel. In the top-left corner of the panels, we show the fractional contribution of the MR ([Fe/H] > 0) and MP ([Fe/H] < 0) populations for each field examined. The histograms are normalised so that the total area under the curve is equal to 1.