<ROIArithmetics>
  <Equations>
    <Equation1 Name="dF2_Ar1" Equation="( meanA2 - meanA4 ) / meanA4 + 0" />
    <Equation2 Name="dF3_Ar2" Equation="( meanA3 - meanA4 ) / meanA4" />
  </Equations>
</ROIArithmetics>