Abstract
Abstract We show that for every ${\varepsilon }>0$, there exists some $g\geq 2$ such that the set of closed hyperbolic surfaces of genus $g$ whose systoles fill has dimension at least $(5-{\varepsilon }) g$. In particular, the dimension of this set—proposed as a spine for moduli space by Thurston—is larger than the virtual cohomological dimension of the mapping class group.
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