range rO2 = O2!;			
range rN2 = N2!;			

rO2.AddCol(currentcor);

//collectionefficiency
coleff = 0.24;

//correct curent with N2 measurement

rO2.col(currentcor) = rO2.col(WE(2).Current (A)) - rN2.col(WE(2).Current (A));

range rO2 = O2!;
range rN2 = N2!;
rO2.AddCol(currentcor);

range rO2Currentcor = O2!col(currentcor);  // the newly added column range
range rO2Col = %(rO2)col(WE(2).Current (A));  // column range in O2 worksheet, use sheet range variable with %() substitution
// range rO2Col = O2!col(WE(2).Current (A));  // use sheet name to declare column range directly
range rN2Col = %(rN2)col(WE(2).Current (A));  // column range in N2 worksheet
rO2Currentcor = rO2Col - rN2Col;