Question about IRF graphs

Stochastic simulations
1

Dear al，
I want to put multipled impulse responses in a graph.I know the data is stored in ‘oo_.irfs’.I got the following figure.

%E6%AF%94%E4%BE%8B
比例.jpg1366×650 66.4 KB

The picture begins with the period 1. My question is how to start with period 0？The data in ‘oo_.irfs’ start from phase one. It looks a little strange. How can we make the following graphics, starting from period 0 ?
image

2

I am not following here. Did you use

plot(0:options_.irf-1,oo_.irfs.whatever);
axis tight;

to set the x-limits?

3

jpfeifer，thank you. ‘axis tight’ solved my problem.