Matlab grouped Barplot with lines

Hey all,

i have created some grouped bar plots, and i will add lines which connecting the maximum value of each bar group.

When i use follwowing code, only the middle line (green) is adjusted right. As the other lines also adjusted the the middle this is wrong.

How can i fix this?

   
A =[6700 13380 20060; 2250 4480 6700; 920 1810 2700; 690 1360 2030]

X = categorical({'1.0','2.0','4.0','5.28'});

a= bar (X,A) 

T1 = [20060 6700 2700 2030]
T2 = [13380 4480 1810 1360]
T3 = [6700 2250 920 690 ]

plot (X,T1)
plot (X,T2)
plot (X,T3)