In large-characteristic finite fields, equiangular lines form tight frames exactly when they meet the Welch bound and their triple-product sums match a fixed value.
Bodmann, My Le, Letty Reza, Matthew Tobin, and Mark Tomforde
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On the Structure of Frames and Equiangular Lines over Finite Fields and their Connections to Design Theory
In large-characteristic finite fields, equiangular lines form tight frames exactly when they meet the Welch bound and their triple-product sums match a fixed value.