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File description:
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--File:                   /data2/a_envoyer/2021/07/20210717_042309_extract2.dat
--File size:               3.02 Go
--size of the Header:     16420    octets
--data:                   Spectrum
--start time:             2021-07-17 04:23:09.374104
--stop  time:             2021-07-17 04:25:18.896838
--duration (min):                2.1587122
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        49410   
--number of frequencies:  4096    
--central freq (MHz):      12.50
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         12.50
--first frequency (MHz):    6.25
--last frequency (MHz):    18.75