The percent of the H I flux as a function of scale lengths color coded by M_HI/M_* ratios. The top panel shows the full extent of the H I on the x-axis while the bottom panel zooms in on the first five scale lengths. The vertical black lines mark 4.4 scale lengths, and the horizontal black lines mark the 75% level of the flux. The side legend lists the galaxies' names and the colors associated with their M_HI/M_* values in the color bar. Most of the galaxies have the majority of their H I flux contained within 4.4 scale lengths based on the stellar light, with the exception of the most gas-rich systems. Galaxies with the most extended H I (i.e., <75% of their H I flux contained within 4.4 scale lengths) are marked with an asterisk. In the extreme cases, the H I flux extends to 10–30 scale lengths.