It would be easier to reply if we could recreate the issue.
From the figure it seems that just changing the x-limits of the plot (with for example xlim(-7e-4, 3e-4) after the plot) would work, but you say "that the domain is cut" in itself...
The only important lines (misleadingly included after a if false) would be:
contourf(x,y,z,[0.1:0.2:0.9 1 5 10 25 50],'ShowText','on');
hold on
plot(xbar,ybar,'or')
So if you cannot include the file1 that is read (we wouldn't care about the .out output file for a fix) you could add a matfile inlcuding an example of the variables x,y,z,xbar,ybar (maybe xbar,ybar are not important either)
Otherwise the issue seems to be in the input file itself and what becomes of xmin
