I'm working at this idea, and learning how to code, I could not find any example on the internet, I hope you guys could help me.
The initial idea is:
0 to 12 =====> x1 ( variable1 ) where x1 is the simple average between 0 to 12
12 to 24 ====> x2 ( variable2 ) where x2 is the simple average between 12 to 24
24 to 36 =====>x3 (variable3 ) where x3 is the simple average between 24 to 36
then: (x1+x2+x3)/3 = z
drawing a Horizontal line on the Chart = HLine value =z