Title: Intersections of $ω$ classes in $\overline{\mathcal{M}}_{g,n}$,
Abstract: We provide a graph formula which describes an arbitrary monomial in {\omega}
classes (also referred to as stable {\psi} classes) in terms of a simple family
of dual graphs (pinwheel graphs) with edges decorated by rational functions in
{\psi} classes. We deduce some numerical consequences and in particular a
combinatorial formula expressing top intersections of \k{appa} classes on Mg in
terms of top intersections of {\psi} classes.