Upper left image is a Pancam color image acquired of the "Magic Carpet" region by
Spirit on Sol 7.  Lower image is monochrome (single filter) image of a rock in 
this area.  Colored portions of rock correlate with extracted spectra shown in
the main plot.  Four different types of materials are shown:  the rock itself, the 
soil in front of the rock, some brighter soil on top of the rock, and some dust
that has collected in small recesses on the rock face ("spots").
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