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File description:
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--File:                   /data2/a_envoyer/2018/10/20181001_145524_extract2.dat
--File size:               80.45 Go
--size of the Header:     40996    octets
--data:                   Spectrum
--start time:             2018-10-01 14:55:24.810827
--stop  time:             2018-10-01 15:18:26.411943
--duration (min):                23.026685
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        527040  
--number of frequencies:  10240   
--central freq (MHz):      21.87
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         31.25
--first frequency (MHz):    6.25
--last frequency (MHz):    37.50