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Fig. 1.
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Histogram of CME–observer pairs included in the study of > 10 MeV proton events versus Δϕ. (a): Stacked plot showing STEREO A, STEREO B, and GOES pairs. (b): Pairs without SEPs at the observer stacked on top of those with SEPs. Δϕ was calculated using the actual measured solar wind speed at the spacecraft.
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