## ExtraVariables

`ExtraVariables` is an option for `OneLoopSum`. It may be set to a list of variables which are also bracketed out in the result, just like `B0`, `C0`, `D0` and `PaVe`.

### See also

[Overview](Extra/FeynCalc.md), [OneLoop](OneLoop.md), [OneLoopSum](OneLoopSum.md).

### Examples