 A semi-logarithmic chart, and you thought there wasn't math in psychology. There is lots of it. For those of you that don't understand that, go away now. Just leave. Just counting. Anyway, off the topic. Semi-logarithmic charts. It's a two-dimensional graph with a lot of logarithmic scale. I have a hard time saying that word. A logarithmic scale on the y-axis, right? So this one. So that equal distances on that y-axis represent changes in behavior that are of equal proportions. You wonder why I keep looking over here, because this definition is pretty good, and this is kind of a tricky thing to say. So again, you're going to need to look up what logarithms are and logarithmic data and representations. But a logarithmic chart literally just shows you that proportions of responding. It's one way to think of it. It's pretty useful in the lab. The lab that I used to hang out in. They used it all the time to look at all sorts of stuff. So it's powerful, and it gives you these relative rates of responding in a sense. So anyway, useful. See you.