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File description:
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--File:                   /data2/a_envoyer/2021/07/20210707_034727_extract2.dat
--File size:               21.89 Go
--size of the Header:     16420    octets
--data:                   Spectrum
--start time:             2021-07-07 03:47:27.666711
--stop  time:             2021-07-07 04:03:06.721565
--duration (min):                15.650914
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        358222  
--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