No irritation...I'm not that irritable. The program that I use, and that is used by the Harvard people, can do something like you describe. ...but the Harvard web page does not show that specifically. Roger also does something like what you are talking about, a different way. Maybe in a few days I can show an example of how I show earthquakes and link it here....but I better do some writing today...after working hard all fall I have not gotten much done the last couple of weeks...and the last 5 days since I hurt my back I have been either going to doctors or trying to work from a couch...better today though..
Chris