Hi,

I'll get right to the point. For my X series I have 7 consecutive dates. For my Y series I have different values representing a disease index. An example for the Y series would be 5, 12, 23, 27, 35, 42, 58. I need to some how have a vertical line drawn after every 18th index, so at 18, 36, 54, 72, etc. It doesn't necessarily need to be drawn at that exact value, it could be drawn every time that value is reached. Does this make sense??? Any help would be appreciated.

Thanks,

Matt