  We explicitly construct a finite set of separating invariants for the basic
$\Ga$-actions. These are the finite dimensional indecomposable rational linear
representations of the additive group $\Ga$ of a field of characteristic zero,
and their invariants are the kernel of the Weitzenb\"ock derivation
$D_{n}=x_{0}\frac{\partial}{\partial{x_{1}}}+...+
x_{n-1}\frac{\partial}{\partial{x_{n}}}$.
