Data Format - Time series of amplitude of the detected signal.
Each file of this type corresponds to a continuous series of measurements, typically several days long. The raw data consists of samples taken at a rate of about four samples per second, with quite a lot of information recorded for each sample. For these files, the data were averaged in groups of 100, since we are not looking for effects which vary rapidly with time.
Each file contains a times series for three quantities. The time for each sample is given in days since 0:00:00 Greenwich Mean Time, on Jan 1 1970. This is how the system time is given in MS-DOS and some other computer operating systems. As an example, noon on November 1, 1996 is 9801.50000 in these units.
There are also two amplitudes given. They represent the rms value of the phase-modulated 200-kHz carrier used in the currrent measurement. Signal A is the received signal, from propagation across 3-Mile Slough in the NE direction. Signal B is the driving signal, as applied to the transducer cable in the gage house.

First line: Title, giving the dates of the run.

Second line: Explains what is each column.

Third and following lines: time, rmsA, and rmsB, written as floating-point numbers, separated by commas.

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