MDFs of all the stars at constant latitudes, where fields at different longitudes have been combined. The fraction of metal poor stars compared to the total is listed in each panel. As discussed in the text, the fraction of metal poor stars decreases from b = −8.5 to b = −3.5, where it reaches a minimum, but then rises again at latitude closer to the Galactic plane. The vertical dashed lines mark the limits of the metal poor and metal rich populations (see text).