keep figure size when copy and paste to microsoft word

I am plotting the following and want to copy/paste the figure to Word with the exact size I set:

close all

nplot=11;

figure(101)

set(gcf,'unit','centimeters','position',[10 0 8.4 14]);

hold on

for iplot=1:nplot

plot((1:100),ones(100),'b')

end

hold off

When nplot is smaller than 11, I can copy and paste the figure directly to word, and the figure size is exactly 8.4*14 cm in Word;

However, when the nplot is set to 11 or above, the figure paste to word is not 8.4*14 cm. Anybody knows how to fix this problem?