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We show that various disconnected components of the moduli space of superstring vacua with 16 supercharges admit a rationale in terms of BPS unorientifolds, i.e. type I toroidal compactifications with constant non-vanishing but quantized vacuum expectation values of the NS x NS antisymmetric tensor. These include various heterotic vacua with reduced rank, known as CHL strings, and their dual type...
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