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File description:
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--File:                   /data2/a_envoyer/2021/04/20210417_082815_extract2.dat
--File size:               55.65 Go
--size of the Header:     20516    octets
--data:                   Spectrum
--start time:             2021-04-17 08:28:15.226505
--stop  time:             2021-04-17 09:00:05.721514
--duration (min):                31.841583
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        728797  
--number of frequencies:  5120    
--central freq (MHz):      14.06
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         15.62
--first frequency (MHz):    6.25
--last frequency (MHz):    21.87