I added a feature that realizes a threshold funtion in graphs. sensor parameter "slowbound" maps all data below the specified boundary value to 0 and values above to 1. Factor and offset can be applied to the results. "supbound" is similar to but maps all data below the trigger value to 1 and above to 0.
This trigger parameters can be used to insert a horizontal color bar into line charts. The colors can correspond to any data that can be used in the chart. The example makes use of it to highlight temperature zones of the temp graph displayed in the chart.
http://wiki.meteoplug.com/Gallery#Color ... Color_Bars