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Each .tar.gz file includes the 1Hz GNSS displacements for a full GPS
day YYYY-DOY.tar.gz
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Once unzipped, each file name in the directory follows the naming
convention YYYYDOY.SSSS.neu where SSSS is the 4-character GNSS
station code.
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Each .neu file contains 4-columns where the data is as follows:
column 1: second from start of day
column 2: north component displacement (m)
column 3: east component displacement (m)
column 4: vertical component displacement (m)

NEU displacements are given relative to the final epoch of the day
(i.e. the last line of the text file will read n,e,u=0,0,0)
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