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There have been recent predictions of topologically unavoidable branch crossing in the energy band structure of solids. In this paper calculations of energy dispersion relations are carried out in a number of crystals with orthorhombic space group (SG) symmetry. Our calculations verify the topological crossings and are in good agreement with the predictions based on representations of SGs.doi:10.1088/0953-8984/15/12/317 fatcat:lvsvjezzmvgntmxhetfng2r7ze