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Figure 1: Daily count rates of 3He and 4He and the abundance ratio 3He/4He on the 3He event days in the energy range 15-30 MeV nucleon-1. The slowly-changing line in the uppermost panel shows a selection limit for an 3He event. A pair of dashed horizontal lines in the lowermost panel shows the levels 3He/4He = 0.005 and 0.05, between which the majority of the 3He event days fall. |
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Figure 2:
Scatter plot of 3He intensity vs. 4He intensity, with background subtracted, on the 3He event days in the energy channel 15-30 MeV nucleon-1 a) and the corresponding day-number distribution over the abundance ratio 3He/4He b).
The dashed lines in panel a) indicate the 0.005, 0.05, and 0.5 levels of the 3He/4He-ratio. The horizontal dotted line in the panel a) exemplifies an average 3He background level. All 4He enhancements with 4He intensity exceeding the threshold level that is shown with the vertical dotted line were accompanied by a measurable amount of 3He.
Curve in panel b) shows a possible fit to the data histogram (
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