The postscript version is so much sharper than the png. No examples are provided but it is so easy that even I can do it. You can download raw time series data into your spreadsheets. Use a newer version. Older versions of Netscape and IE may require using the old plot system as they do not support png graphics.
Animation is available.
The animation facility, however, is not for the populace. Use xkill to stop an animation. Ben Quinn and Anthony Cornelius have some advice .