## ExtraPropagators

`ExtraPropagators` is an option for `FCLoopFindTopologies`. It can be used to specify extra propagators that do not explicitly appear in the input expression but must be taken into account when constructing the sets of propagators.

### See also

[Overview](Extra/FeynCalc.md), [FCLoopFindTopologies](FCLoopFindTopologies.md).

### Examples