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File description:
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--File:                   /data2/a_envoyer/2018/07/20180731_143034_extract2.dat
--File size:               44.89 Go
--size of the Header:     24612    octets
--data:                   Spectrum
--start time:             2018-07-31 14:30:34.166247
--stop  time:             2018-07-31 14:51:58.624659
--duration (min):                21.407640
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        489983  
--number of frequencies:  6144    
--central freq (MHz):      15.62
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         18.75
--first frequency (MHz):    6.25
--last frequency (MHz):    25.00