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-W3EEE's graph for 17th/18th Jan 03
It's the space between the level of DCF39 in yellow and the noise plots in green and grey that indicate the likelyhood of trans-Atlantic reception of amateur signals. Here we see a sig/noise of about 35dB after 0600 which should have been very good. If only anyone had been on!
See Steve's website for all the information on his system.