https://scontent-icn1-1.xx.fbcdn.net...61&oe=5A7FAC02
Thanks for reply.
To make my muddled brain a bit clearer...
If I start with 110,000 lbs and follow the dashed line--it looks like dashed lines represent weight--until I meet a set of three? diverging curves.
Upward sloping curve the middle curve, and downward sloping curve.
From here, I get stuck.
What information can I deduce from the three curves for a given weight value?