How to set reference line when y-axes is interval

[#1]

Hi,

I have my y-axes (expression) set to show sum of intervals. I'd like to set a reference line at 24 hours, but I can't figure out what to enter in the reference line expression. I tried time('24', 'HH') but that doesn't seem to work.

[Gysbert_Wassenaar · Accepted solution]

24 hours is 1 day. The unit of the y-axis will probably be in days. So try setting the reference line at value =1.