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Number of doublets (two cosmic ray detections in an interval of 5 minutes) found in data (red) in every 24 hour period versus the expected value obtained from background simulations(dark blue). Number of doublets needed to obtain a 3 or 5 sigma effect are also given (green and light blue, respectively).
Significance of number of doublets (two cosmic ray detections in an interval of 5 minutes) found in data in every 24 hour period.
The number of detections per 24 hours (rate) as a function of time..