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File description:
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--File:                   /data2/a_envoyer/2021/08/20210807_234311_extract2.dat
--File size:               23.39 Go
--size of the Header:     16420    octets
--data:                   Spectrum
--start time:             2021-08-07 23:43:11.934295
--stop  time:             2021-08-07 23:59:55.751823
--duration (min):                16.730292
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        382927  
--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