some plots showing the microphone and DARM noise for 1minute around the times reported in the table for the helicopter flights over CEB:
- figure 1 - spectrograms, helicopter above CEB at altitude 2000ft
- figure 2 - spectra, helicopter above CEB at altitude 2000ft (compare qui quiet time)
- figure 3 - spectrograms, helicopter above CEB at altitude 1500ft (compare qui quiet time)
- figure 4 - spectra, helicopter above CEB at altitude 1500ft (compare qui quiet time)
- figure 5 - spectrograms, helicopter above CEB at altitude 1000ft (compare qui quiet time)
- figure 6 - spectra, helicopter above CEB at altitude 1000ft (compare qui quiet time)