Let $\mathfrak{X}$ be a strongly nondegenerate strictly polystable formal model of $X^{\textup{an}}$ over $K^{\circ}$ with associated skeleton $\Delta$. Let $\tau$ be an $n$-dimensional open face of $\Delta$ and $h$ a convex function on $\tau$. Denote by $\overline{\mathcal{O}}^{h\circ p_{\mathfrak{X}}}$ the trivial bundle on $p_{\mathfrak{X}}^{-1}(\tau)$ endowed with the metric given by $\|1\|=e^{-h\circ p_{\mathfrak{X}}}$. Then the latter is locally a semipositive metric (Definition 4.17) and

$$c_{1}\left(\overline{\mathcal{O}}^{h\circ p_{\mathfrak{X}}}\right)^{n}=\Deg(S)\cdot n!\cdot\MA(h)$$

on $p_{\mathfrak{X}}^{-1}(\tau)$ where $S$ is the point in the special fibre of $\mathfrak{X}$ corresponding to $\tau$.