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Fig. 2


A scheme of a symbiotic binary to calculate nH along the line of sight, l, throughout the neutral H i region (Eq. (4)). The thick solid line represents the H i/H ii boundary (Sect. 3.3) and ϑ is the angle between l and the binary axis. Other auxiliary parameters are introduced in Sect. 3.1. Distances are in units of the binary components separation, p.

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