Use the control panel on the left to change settings and click on UPDATE button to update the display. Clicking on the PREVIOUS button will display an image using data from the previous time interval. Clicking on the NEXT button will display an image using data from the next time interval. Clicking on the POSTSCRIPT button will produce a PostScript version of the image. The HOME button will return you to the Home Page. The HELP button will open an additional help window. Using smaller image reduces waiting time for images to load. You can use a larger image for the final view. To view the image in a window by itself, right click on the image and select the View Image option. Image may be saved to your local hard disk by right clicking on it and selecting the Save Image As ... option. Make sure you enter a PNG (Portable Network Graphics) image name. (It may show the file as ion-i.html, but type in a PNG file name). The HOME button will return you to the Home Page. The HELP button will open an additional help window. NOTE: On some systems/browsers, whenever the produced image is redrawn (open frame in new window, resizing the window,clicking the BACK Button, Save Image, etc.), the image may have to be recreated again. Please limit your usage of these options to get maximum performance of this service.