Thank you both so much for the answers! I was wondering if there was a specific function for something like this that I had missed - I'll change the points to something spiffy in that case.

Just want to make a mildly anal retentive point that the five minute mark is the median, it's the midpoint of the experiment.

And always appreciative of these notes - but I'm a bit confused, did you mean the five minute mark isn't the median here? If that's what you mean, I've gotcha; I always get median confused with.. well, all the others. Hahaha! They called it the median in the coursework, but I added the distinction in my original post as I wasn't so sure either.