Yes, I find it confusing also. I've been reporting the value that Lady Heather uses to do most of her evil internal message off machinations with... For those, the negative offset value is the "natural" polarity. I'm probably going to change it around to something humans (including me) find more natural to interpret. ----------------- > Thanks, Mark. I'd missed that in the post. I still find it confusing to plot positive times as negative ones.