below weirdness in slide 11/13

[thattommyhall]

Slide 11 implies (below p1 p2) has p1 under p2 but slide 13 implies that it is the opposite way. Which is the correct one? And, btw, I had to "reverse" the y-coords of the george I found on the inet because the project code has the y-axis pointing down, am I right in this?
@jmgimeno