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File description:
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--File:                   /data2/a_envoyer/2019/04/20190419_021959_extract2.dat
--File size:               90.01 Go
--size of the Header:     32804    octets
--data:                   Spectrum
--start time:             2019-04-19 02:19:59.595639
--stop  time:             2019-04-19 02:52:11.678219
--duration (min):                32.201376
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        737032  
--number of frequencies:  8192    
--central freq (MHz):      18.75
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         25.00
--first frequency (MHz):    6.25
--last frequency (MHz):    31.25