I can't apply my knowledge of shielding to explain the three slopes

[adf89812]

TL;DR Summary

Why red,purple,green slopes not all the same?

Also, why does red taper off slope towards the end of the subsequence, but green and purple never taper off in slope (flatten out)?

 

[berkeman]

Welcome to PF.

What is the source of this plot? Can you say more about it?

Also, is this question for schoolwork?

 

[Drakkith]

Also, why does red taper off slope towards the end of the subsequence, but green and purple never taper off in slope (flatten out)?

Purple only has 2 points per subsequence, so you can't really say it does or doesn't taper off. But the green points certainly look like they are tapering off to me. Assuming 'tapering off' means that the slope shallows out as Z increases.