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File description:
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--File:                   /data2/a_envoyer/2021/10/20211017_200440_extract2.dat
--File size:               86.74 Go
--size of the Header:     40996    octets
--data:                   Spectrum
--start time:             2021-10-17 20:04:40.410683
--stop  time:             2021-10-17 20:29:29.949576
--duration (min):                24.825648
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        568215  
--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