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Notes:
                    Negative Detection
Observer     Location           Transmitter             Comments
Schnoor      Kiel, Germany         HBG              SGR 57 degrees below horizon
Clerkin      Massachusetts, USA    NAA
Anderson     Perth, Australia      NWC
Welch        Ontario, Canada       NAA      Local sunset and SGR near Sun on
                                            opposite side of transmitter
Welch:Dundas, ON, Canada monitoring NAA at 24.0 kHz in Cutler, ME