Sorry, I must not have explained this well enough. I don't want every
18th value to be charted on the graph, what I want is once the index
reaches 18, say on March 3, then there should be a vertical line on the
graph. If the index reaches 36 on March 5 then there should be another
vertical line, and so on.

I've included a sample of a chart to give you a better idea.

Thanks again,

Matt


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