I think this is a bug in the ActiveX control whenever "large" datasets are being plotted. I see the same thing when doing boxplots of "large" datasets. The html files built by the control seem to be quite inefficient when it comes to size (eg a 21Mb file being created in your example). Try using a different graph type (eg GIF) and see. I think there is a lot of work to be done to the ActiveX control to fix the size issue and also to extend the funtionality. My 2 priorities would be: 1. A way to change the axis scale (a proper ZOOM would also be acceptable) 2. Extending it to the rest of the graphs (eg probability plot) ... View more