Shading Different Parts of an Area chart

[derivative_x]

Hello.

I'm trying to shade different portions of an area chart, but not having alot of luck.

In the spreadsheet attached, I'm trying to shade the portion of the chart from 1-52 weeks as yellow, 52-104 weeks as green, and 104-156 weeks as blue:
Savings Accumulation.xlsx

How and where should I start?

Thanks for the future advice

[Andy Pope]

Easiest way is to have 3 series.