Not sure what you mean, precisely, but try
subplot(3,1,1)
bar(R11)
hold on
hE=errorbar([1:length(R11)],R11,t*ones(size(R11)),'*');
hL=get(hE,'children');
set(hL(2),'linestyle',':')
etc., for other axes...
for starters. Salt to suit.
Oh, for a simple line, well, there's line...
bar(R11)
line([1 length(R11);1 length(R11)].',[-t -t;t t].','linestyle',':')
