The ozone groups of the algebras $B_q(f)$

Let $q$ be a primitive $n$-th root of unity, $n>1$, and let $f$ be a nonzero polynomial such that $n\nmid(j+1)$ for every $j\in\supp(f)$. Set $e=\gcd(n,\{j+1:j\in\supp(f)\})$. We show that $\Oz(B_q(f))\congμ_e\timesμ_e$: the defining relations are homogeneous for a $\mathbb{Z}/e\times\mathbb{Z}/e$ g