Bandwith calculation and display

[#1]

Goodmorning all,

I want to create a chart with metrics that have to be compared to a indicator value and an inner and outer bandwidth (with a lower and upper value). I got two questions:

- Whats the best way to make the comparison between the metrics and the indicator/bandwidths? An intervalmatch in the script?
- Is there any way to display the bandwiths not as a (reference) line but as an area.

I got two images to support the idea of the area:

What I have now looks like (blue are the metrics, green is the indicator, yellow/red are my bandwidths):

And what I would like to show is: