Proposition 20.3.52.13817C91E7B4 For every $v\in \mathrm{PSH}(B,a\kappa )$,
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20.3.53
\begin{equation} \int _ Y\mathrm{MA}_{\Omega _{a,b}}(q^*v) =2nb\int _ B\mathrm{MA}_{a\kappa }(v). \end{equation}
In particular, the trace envelope in (20.3.49) has mass between $2nb(a/2)^ d$ and $2nba^ d$.
Proof.
Normalize $v\leq 0$ and put $v_ j=\max (v,-j)$. For bounded potentials, the horizontal current has rank at most $d=n-1$ and $\beta ^2=0$, so the bounded local product gives
\[ (\Omega _{a,b}+\mathrm{dd}^{\mathrm{c}}q^*v_ j)^ n =nb\, \beta \wedge q^*(a\kappa +\mathrm{dd}^{\mathrm{c}}v_ j)^ d. \]
This identity follows by local decreasing regularization on base charts and the bounded product convergence of section 13.14; it does not require $\beta $ to be closed. Restrict to $q^{-1}\{ v>-j\} $ and pass to the increasing non-pluripolar measures. Fiber integration gives (20.3.53), and (20.3.47) gives the two bounds.
$\square$
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