diction. In the 772.0-nm band, the color prediction gave a time constant of 8.3 seconds; the intensified camera data gave a time constant of 35.4 seconds. The color prediction of total light was approximately 100 times as great as that measured by the intensified camera. We are unable to explain this discrepancy at this time. In summary, we found that a very small fraction of the water vapor froze (~ ten percent) and that once frozen, it decayed with a 10- to 15-second time constant.
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