In addition to the bands you can also add static lines to the graph. An example of that is actually shown in figure 11 above. You create a line as an instance of class PlotLine . So for example the lines
$sline
= new PlotLine
(HORIZONTAL,0,
"black",2);
$graph->Add(
$sline);
will add a 2-pixel wide horizontal static line at Y-position zero.