Multi histogram work

nbins=4;
series1 = [9930 9379 9185 8837 8302 7778 7216 5947 5655 5489 5334 4828 4789 4623 4605];
series2 = [7367 6259 6149 5716 5540 5163 4398 4217 3968];
series3 = [7288 5797 5394 4859 4845 4432 4010 2703];
[series1,centers] = hist(series1,nbins);
[series2] = hist(series2,centers);
[series3] = hist(series3,centers);
DataSum=series1+series2+series3;
figure
bar(centers,DataSum,width1,'FaceColor',[0.2,0.2,0.5],'EdgeColor','none');
hold on
bar(centers,series2,width2,'FaceColor',[0,0.7,0.7],'EdgeColor',[0,0.7,0.7]);
hold off
legend('Never played','< 3 hours','3+ hours')