U' = associatedK3surface X
For more details and notation, see the paper Explicit computations with cubic fourfolds, Gushel-Mukai fourfolds, and their associated K3 surfaces.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/SpecialFanoFourfolds.m2:3530:0.