Vertical metallicity gradient in inner bulge and GC region. Shown are results for MR (red dots), MP (blue dots), and all the stars together (black dots) from the merged samples of FK17+R17 in the GC region, N18+Za19+Zo17 in the b = ±1° and b = ±2° fields, N18+Za19 in the b = ±3° field, and results from Schultheis et al. (2017) in the BW. Errorbars refer to 1σ dispersions. Dotted lines show the linear fit including the GC region, while the solid lines show the fit omitting the GC region.