Pressure in the outer crust against baryon density using the experimental nuclear masses (Audi et al. 2012; Wolf et al. 2013) when available and the BCPM energy density functional or the FRDM mass formula (Möller et al. 1995) for the unmeasured masses. Also shown is the pressure from models BSk21, BPS, Lattimer-Swesty (LS-Ska), and Shen et al. (Shen-TM1) (see text for details). The dashed vertical line indicates the approximate end of the experimentally constrained region.