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The first image is a JPEG color image. This image is fairly
small (less than 100kbytes). Most web browsers will display JPEG directly.
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The other images are TIFF (grey-scale). Your browser may
have to invoke an external viewer for these. They are large (1 Mbytes)
and may take quite some time to load.
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ir2, ir3, ir4 and ir5 are taken in various infrared wavelengths.
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vis is in the visible light, so there may be dark areas at
night - or during a total eclipse of the sun.
There are many freeware or shareware TIFF viewers on the
net. I can recommend IrfanView. Check TUCOWS
or Here
for more samples.