Total HI map of Holmberg II. The 1.5  × 10²⁰ atoms cm^-2 contour is shown for the observations (black), the model data cube based on the parameters derived by Oh et al. (2011) (red), and the parameters derived in the present paper: the two blue lines represent the two extremes of the outer inclination range allowed by the data (20° to 35°). The FWHM beam size is 13.7  ×  12.6 arcsec.