Standard deviation of the difference maps.
|Difference map||Y ii||Sr ii||Ti ii||Cr ii|
|Oct. 2000: part1–part2||0.077||0.023||0.014||0.019|
|Oct. 2000–Dec. 2000||0.132||0.044||0.029||0.031|
|Dec. 2000–Aug. 2009||0.215||0.091||0.049||0.034|
|Aug. 2009–Jan. 2010||0.087||0.045||0.042||0.026|
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