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File description:
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--File:                   /data2/a_envoyer/2021/08/20210831_002917_extract2.dat
--File size:               151.64 Go
--size of the Header:     24612    octets
--data:                   Spectrum
--start time:             2021-08-31 00:29:17.856005
--stop  time:             2021-08-31 01:41:36.952607
--duration (min):                72.318277
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        1655235 
--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