Let $\alpha\in A^{p,q}_{c}({X^{\rm an}})$ be a differential form with $\max(p,q)=\dim(X)$. Then there is a very affine open subset $U$ of $X$ such that ${\rm supp}(\alpha)\subset{U^{\rm an}}$ and such that $\alpha$ is given on ${U^{\rm an}}$ by a superform $\alpha_{U}\in A_{c}^{p,q}({\rm Trop}(U))$.