Do you have the Statistics Toolbox?
x = 1:10;
y = sin(x);
e = std(y)*ones(size(x));
errorbar(x,y,e,'bo','markerfacecolor',[0 0 1])
Not sure exactly what you mean by "between red and green graphs"
I'm assuming that each data point is an estimate and you have an associated confidence inteval that you want to represent