xact – Rewriting of all terms in Riemann-Tensor

Is there any command to rewrite all the terms of curvature like $$R$$ or $$R _ { alpha beta}$$ or $$R _ { alpha beta} ^ {~~~~~ gamma delta}$$ in relation to the Riemann tensor $$R _ { alpha beta gamma delta}$$ and the metric tensor in `xAct`?
For example this part of a problem:

``````(ScriptCapitalL) = 1/(16 Pi G) (-2 (CapitalLambda) + RicciScalarCD())
``````

How can I compare this Lagrange vs. $$R _ {- alpha, – beta, – gamma, delta}$$?