Panel a: Atomic gas mass, M_{H i} versus H i disk size, R_out, and b) W₅₀/ 2 versus R_out of the moria dwarfs (green, with symbols as indicated in Table 1. Green dots indicate simulations not in the table) versus observations compiled in P16 (in black). For the simulations, R_out is the semi-major axis of the best-fitted ellipse to the contour with Σ_{H i} = 1 M_⊙ pc^-2. The relation in panel a is the one found for the FIGGS sample at 1 M_⊙ pc^-2 (log (M_{H i}) = 1.96log (2R_out) + 6.37; Begum et al. 2008a).