Topic: Strange lines
A graph I created has some unusual horizontal lines on it. If you copy and paste more copies of the functions, more lines will show up. They move vertically when the coordinate system is moved, but not horizontally. Pasting the functions into another instance of graph makes them disappear, so I'm not sure what causes this, or even how it happened in the first place. ...and clearly this is a pretty minor issue, but I thought I'd alert you to it anyway.
Please see the example file attached to see what I'm talking about.