I am trying to read M. Kapranov's paper "Real mixed Hodge structures". He defines (over $\mathbb C$) a category $\operatorname{Bun}_\nabla(\mathbb A^2; \mathbb G_m^2) $of vector bundles on $\mathbb A^2$, invariant under the natural action of $\mathbb G_m^2$ and equipped with an invariant connection.
He then defines the dual projective plane $\mathbb {P^2}^\vee$ of lines in $\mathbb P^2$, and sets $\mathbb {P^2}^\vee_0 = \mathbb {P^2}^\vee \setminus \{[1:0:0]\}$.
Then, on page 5, he gives "incidence diagrams". Please refer to (1.2.2) in the paper I linked.
My question is simple: What are $Q_0$ and $Q$ in this diagram? He doesn't define these objects anywhere in the paper.
$Q_0$ is the set of pairs $(x,L) \in \mathbb{A}^2 \times \mathbb{P}_0^{2\vee}$ such that $x \in L$, while $Q$ is the extension to the full $\mathbb P^2$ and its dual.