For weak Q-Fano threefolds of Picard rank two, the anticanonical volume is at most 64 except for one explicit projective bundle, which has volume 72.
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A Supplement to the anticanonical Volumes of weak $\mathbb{Q}$-Fano threefolds of Picard rank two
For weak Q-Fano threefolds of Picard rank two, the anticanonical volume is at most 64 except for one explicit projective bundle, which has volume 72.