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In our previous work, for a given Riemann surface $Y_0$ with marked handle,we investigated geometric properties of the set of marked once-holed tori $X$allowing holomorphic mappings of $X$ into $Y_0$. It turned out that it is aclosed domain with Lipschitz boundary. In the present paper we show that theboundary is never smooth. Also, we evaluate the critical extremal length forthe existence of holomorphic mappings in terms of hyperbolic lengths.

On sets of marked once-holed tori allowing holomorphic mappings into Riemann surfaces with marked handle