Rotation curve models for three isolated dwarf irregular galaxies: NGC 6822 (top); WLM (middle); and IC 1613 (bottom). For IC 1613, we show results for two different inclination angles: i = 39° and i = 15°, as marked. The columns show from left to right: the H i column density map with size-scale and beam-size marked; the rotation curve data; and histograms of M₂₀₀ and c from our emcee model chains. For the latter three panels, the lines and symbols are as in Fig. 2. On the rotation curve plot (second column), we mark the position of H i holes seen in the column density map (leftmost column) of NGC 6822 and IC 1613. On the concentration parameter plot (rightmost column), we mark the cosmological mean c_ΛCDM (vertical green line), expected for a halo with the median M₂₀₀ from our model chains.