Way to demodulate OTA files by KD7LMO.net

Hello:

I am a new user of gnuradio. I have successfully installed, and done
some tests (dialtone and so on). I am trying to use the captures in

http://www.kd7lmo.net/ground_gnuradio_ota.html

to do something more real. I have no problem using the scripts in

http://www.kd7lmo.net/ground_gnuradio_software.html

to listen to the 4 stations in nws_nbfm_4_stations_256k_complex.dat but
I do not understand how to demodulate the WBFM (e.g.
wbfm_969mhz_512k_complex.dat).

What is the proper way to demodulate that signal? Is there a sample
python script I can use?

Thanks in advance

E.

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