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File description:
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--File:                   /data2/a_envoyer/2018/10/20181001_141915_extract2.dat
--File size:               49.78 Go
--size of the Header:     32804    octets
--data:                   Spectrum
--start time:             2018-10-01 14:19:15.262506
--stop  time:             2018-10-01 14:37:03.842709
--duration (min):                17.809670
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        407632  
--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