Your questions make me think about the step i wrote, I just say put [x,y] in it without starting from specific point.
I guess I should start from x=14, then run x=14+n for the left spots. In that way, I could draw a lot until x= 492
there are two issues I had: 1. the gap between numbers on x-axis and y-axis are different, will this affect the length of segment?
2. I also found that when x=492, y has two points. Not sure how to represent that.
grace-xing6
gxing