0MXW Proof. This follows from the localisation sequence and Mcโก(๐ธn)=โโก(n)โ[2โn].\operatorname{M}^{c}(\mathbb{A}^{n})=\mathbb{Q}(n)[2n]. A proof can be found in [Ebe21, Lemma 2.3(10)]. โ