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File description:
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--File:                   /data2/a_envoyer/2021/11/20211119_175537_extract2.dat
--File size:               5.53 Go
--size of the Header:     16420    octets
--data:                   Spectrum
--start time:             2021-11-19 17:55:37.735923
--stop  time:             2021-11-19 17:59:35.196433
--duration (min):                3.9576752
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        90585   
--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