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File description:
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--File:                   /data2/a_envoyer/2021/07/20210717_031238_extract2.dat
--File size:               69.40 Go
--size of the Header:     32804    octets
--data:                   Spectrum
--start time:             2021-07-17 03:12:38.212624
--stop  time:             2021-07-17 03:37:27.751558
--duration (min):                24.825649
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        568215  
--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