Abstract
It is shown theoretically and experimentally that the total topological charge of optical vortices associated with linearly polarized orthogonal components and positioned on, s-contours bounding some field's area is equal to the doubled total topological index of C-points located in this area. This conclusion is valid also for field regions, which contain areas with different kind of polarization (left- or right-hand) independently on the number and structure of such areas.
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