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File description:
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--File:                   /data2/a_envoyer/2021/07/20210717_020752_extract2.dat
--File size:               111.88 Go
--size of the Header:     40996    octets
--data:                   Spectrum
--start time:             2021-07-17 02:07:52.452128
--stop  time:             2021-07-17 02:39:53.739595
--duration (min):                32.021458
--dt (msec):                  2.621440
--accumulation:           8       
--number of channels:     4       
--number of cubes:        732914  
--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