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File description:
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--File:                   /data2/a_envoyer/2020/07/20200721_004351_extract2.dat
--File size:               21.37 Go
--size of the Header:     40996    octets
--data:                   Spectrum
--start time:             2020-07-21 00:43:51.832999
--stop  time:             2020-07-21 00:49:58.818858
--duration (min):                6.1164310
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        139995  
--number of frequencies:  10240   
--central freq (MHz):      21.87
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         31.25
--first frequency (MHz):    6.25
--last frequency (MHz):    37.50