How can I enlarge graph area?

I've plotted the graph from the attached image. I want to enlarge the graph area so that I can see the lines close to 1.

I read the doc and tried with ylim([0 2]) but it changed my Ytick values: I'm using

ay = gca;
 ay.YRuler.TickLabelFormat = '% .2f';
 set(gca, 'YTick',y)

I didn't want to see values above 1, I only want to see the line more easily.

Answer 1

[Walter Roberson]

yt = ay.YTick;
ylim([0.9 1])
ay.YTick = yt;    %force the ticks to go back to what they were before