We prove the switching equivalence of the strongly regular polar graphs N O ± ( 4 m , 2 ) , N O ∓ ( 2 m + 1 , 4 ) , and Γ ( O ∓ ( 4 m , 2 ) ) with an isolated vertex by giving an analytic description for them and their associated two-graphs.
Nagy et al. (Tue,) studied this question.