I am busy writing a thesis and am plotting some data using the clustered column graph. I have 5 values on the X-axis (time in days.. 0-4), and for each of these X-axis values (days) I have 3 Y-values (high, medium, low dose observations). The problem is that each Y-axis value is a mean, and has a unique standard error of the mean (SEM). However, I can't find a way to make unique error bars for each data point. Instead, it will only allow me to enter 1 custom error bar value per dose observation over time. I feel like this is doable, but I just can't figure it out. Perhaps I just need to use another graph format? I feel like there is something really obvious that I am missing. I don't know if this is clear, but was wondering if anyone can help. I really don't want to have to draw these error bars in using powerpoint. I can elaborate if need be.