Galactic parameter values obtained for samples in sets A and B. In each sample, sources are added in the northern hemisphere simulating the future BeSSeL results (set A) and without location limit simulating samples when southern arrays can contribute with data (set B). First and current BeSSeL results published in Reid et al. (2009, 2014), respectively labeled “Fit 3” and “Model A5”, are shown as stars for comparison. The initial values adopted in the model are represented as dashed lines. Gray regions correspond to values and uncertainties obtained for the complete sample (N = 1300).