How to set range of y-axis for THStack?

Hi,

I haven't succeeded at the simple task of setting the y-axis range for a THStack using all possible ways I could think of.

The example script I have attached demonstrates all the things I've tried. Most of them indeed do influence the y-axis range, but none yields targeted value of 3.

Using ROOT 5.30/00. The y-axis is logarithmic.

I'd be grateful for any hints.

cu
Alexander