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File description:
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--File:                   /data2/a_envoyer/2018/05/20180512_011525_extract2.dat
--File size:               36.20 Go
--size of the Header:     49188    octets
--data:                   Spectrum
--start time:             2018-05-12 01:15:25.832342
--stop  time:             2018-05-12 01:24:03.931161
--duration (min):                8.6349803
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        197640  
--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