X-axis and background

[mori3848]

Hello, Thank you for your useful and appealing plugin. I have a few questions.

Is it possible to specify the starting point on the X-axis? For instance, can it start from 0 when all the numbers in the graph are greater than 40?
Can I select specific numbers as cut-off points, such as 60, 75, 85 and 115?
Can the graph be colored differently within certain ranges: green from 0 to 60, orange from 60 to 85, and red above 85?
Is it possible to have different background colors within the range of the cut-off points?