Contour plots of the ﹩{\chi }^{2}﹩ fit for the ⁴⁹Ti/⁴⁹V and ⁵¹V/⁵¹Cr ratios and the combined ﹩{\chi }^{2}﹩ calculation (the same colors as in Figures 2 and 4) for the disk-like model (left panel) and the spiral-arms model (right panel) after reducing the fragmentation cross sections for ⁴⁹Ti by 15% and 20%, respectively.