  Fix a compact connected Lie group $G$ with Lie algebra $\mathfrak{g}$, as
well as a strong Gelfand-Cetlin datum on $\mathfrak{g}^*$. Let us also fix a
connected symplectic manifold $M$ endowed with an effective Hamiltonian
$G$-action and proper moment map. We associate to such information a measure on
$\mathbb{R}^{\mathrm{b}}$, where $\mathrm{b}=\frac{1}{2}(\dim
G+\mathrm{rank}\hspace{2pt}G)$. We also express the Radon-Nikodym derivative of
this measure in terms of the volumes of the symplectic quotients of $M$ by $G$,
and thereby prove a non-abelian version of the Duistermaat-Heckman theorem.
