I am trying to produce a bar chart of "results".  That part is easy enough.  The second thing is that I'm trying to produce two single lines above each bar.  The first line is a "warning" limit and the second line is a "failure" limit.  The problem is that for each data point these values can vary, so it isn't just straight line across the chart.  Is there any way to accomplish this?  It could even just be a single "marker" of some kind indicating what the limit values are for each result.