There is nothing in the API that allows for something like this. You could try to hack the chart's SVG to get a green background for part of the chart, but this would not be easy. As an alternative, you could use the new 'scope' column role (see http://code.google.com/apis/chart/interactive/docs/roles.html#whatrolesavailable) to define which points are in scope (100-200) versus those which are out of scope (<100, >200). The chart draws out of scope points grey, with grey lines connecting consecutive out of scope points.
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