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11.5 - 12.5 microns
4-km FOV sampled every 2.3 km east-west
0.26°C temperature uncertainty when viewing 300 K
Moderately sensitive to moisture low in the atmosphere
Usually has cooler brightness temperatures than the longwave IR window
Enables surface temperature estimate when used as split window
Used to estimate total precipitable water vapor and atmospheric instability
Helps in detection of volcanic ash plumes when combined with 10.7 micron channel