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File description:
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--File:                   /data2/a_envoyer/2018/12/20181225_101240_extract2.dat
--File size:               135.75 Go
--size of the Header:     49188    octets
--data:                   Spectrum
--start time:             2018-12-25 10:12:40.035735
--stop  time:             2018-12-25 10:45:02.913389
--duration (min):                32.381294
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        741150  
--number of frequencies:  12288   
--central freq (MHz):      25.00
--freq echantillon (MHz): 200.00
--Bandwidth (MHz):         37.50
--first frequency (MHz):    6.25
--last frequency (MHz):    43.75