Fig. A.1.

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Example of converting an asymmetry score map into a binary ionization map (top panel), and converting an ionization map into a binary ionization map (bottom panel). The left column shows the original maps. The second column shows the maps converted into binary maps by setting all the pixels with asymmetry score () above (below) a threshold ionized. The third column shows the binary map after we use scipy.ndimage.binary_fill_holes, to fill the holes, which correspond to areas inside bubbles, in the second column.
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