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Prior to August 2016, instead of diverting the entire frequency range of the data, the military diverted only a low frequency band of the data. When this filtering occurred, the file-name was appended with 'LPF' or 'HPF' for high-pass or low-pass filtering. Sometimes one-half of this diverted is was available live, while the other component is was withheld for review. Usually that withheld data is was returned, after a delay of 3 days to 2 months. Once filtered, this data remained in the LPF/HPF frequency bands.
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