Metallicity distribution function (MDF) for the 26 fields of the present study. Orange histograms have been derived from CaT spectra, while green histograms come from the high-resolution spectra discussed in Paper II. Blue histograms are from our previous works. Panels are arranged in the same way as the fields in the sky, with approximate coordinates indicated in the labels. The number of stars observed in each field is also labeled for each field.