Free arrays allocated with a call to Enlist and under .NET also copy the contents of arrays back to the coresponding objects.

procedure DismissIt(a: TMtxVec; b: TMtxVec; c: TMtxVec; d: TMtxVec; var ap: TDoubleArray; var bp: TDoubleArray; var cp: TDoubleArray; var dp: TDoubleArray); overload;