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brightness of the features. During the first trimester, the halos were 4 ± .3% brighter than the non-halo areas. Then in the second trimester the halos became more prominent at 7 ± .7% brighter. Toward the end of their life they were the brightest recorded at 8 ± .6% brighter than the surrounding topography. The halos are brighter than the surrounding region due to the impurities in the ice. The global dust storm filled the CO₂ ice with sand and increased the grain size of the ice crystals.

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