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We compare data obtained by two secondary cosmic ray detectors with different characteristics, located at Mt Chacaltaya, Bolivia (altitude 5200m) and Niteroi, Brazil (sea level) respectively, separated by a distance of ∼2700km but both inside the so-called South Atlantic Anomaly (SAA) region, with different magnetic rigidities (cut-offs). A preliminary analysis, made on data obtained in September...
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