I am using flot to create bar charts like

I need to specify a threshold like a line at 750(y axis) for example, to show the limit…
there is one jquery.flot.threshold.js file in flot package, but i dont know how to use it on bar charts.How to do it ?
Seems there was some issues with using the threshold plugin with the current flot release version. If you just want to mark a threshold, it might be easier to use the grid markings option:
Produces (fiddle here):