  We answer an open question posed by the second author at the Salzburg
workshop on Dependence Models and Copulas in 2016 concerning the size of the
family $\mathcal{A}^\rho_v$ ($\mathcal{A}^\tau_v$) of all Pickands dependence
functions $A$ whose corresponding Extreme-Value-Copulas have Spearman $\rho$
(Kendall $\tau$) equal to some arbitrary, fixed value $v \in [0,1]$. After
determining compact sets $\Omega^\rho_v, \Omega^\tau_v \subseteq [0,1] \times
[\frac{1}{2},1]$ containing the graphs of all Pickands dependence functions
from the classes $\mathcal{A}^\rho_v$ and $\mathcal{A}^\tau_v$ respectively, we
then show that both sets are best possible.
