Hold the left mouse button down as you drag the slider above the image (or use the arrow buttons) to fade between the GOES-8 visible image and the corresponding 3.9 micrometer shorwave InfraRed (IR) image at 20:02 UTC (2:02 PM Central time) on 21 Dec 2000. To zoom, click on the "Zoom" button, and then click the "hand" cursor on the image where you want to center the zoom.