function G = MGain_2est(Delta)
global Col nominal y_nom

% str = HyCase.Flowsheet.MaterialStreams.Item('F'); %pointer to stream named 2
% F = str.MolarFlowValue;


T = Col.ColumnFlowsheet.TemperaturesValue; 
BB(1:length(T)) = T;

%G = abs(BB - nominal(23:end)) / (Delta);
G = (BB - y_nom) / (Delta);