By the pointed canonical bundle formula the canonical bundle of $\overline{M}_{g,n}$ is given by $$K_{\overline{M}_{g,n}} = 13\lambda+\psi-2\delta-\sum_{I}\delta_{1,I}$$ where $\lambda$ is the Hodge class, $\psi = \sum_{i=1}^{n}\psi_{i}$ is the sum of the psi-classes and $\delta$ is total boundary divisor.

**Are there constraints involving $g,n$ which imply that $K_{\overline{M}_{g,n}}$ is ample ?**