Evolution of D/H in the solar neighborhood (left panel) and distribution of D/H along the Galactic disc at the present time (right panel). The predictions of Models A and B are shown (red solid and dashed blue lines, respectively). At t = 0 Gyr, we plot the WMAP value (filled black diamond). The PSC data by Geiss & Gloeckler (1998) are shown (filled green circle). The local interstellar medium (LISM) data are from Linsky et al. (2006), Hébrard et al. (2005) and Prodanović et al. (2010) (filled orange, light blue, and magenta triangles, respectively). The data for the outer disc (R_G = 10 kpc) are from Rogers et al. (2005, filled bordeaux circle).