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Maps of lunar epithermal neutron flux measured by LEND uncollimated detector SETN (upper) and collimated detector CSETN (lower), with corresponding color bars in units of neutron counts per second. Background pedestal signal has not been subtracted from the neutron count rates displayed here. Differing morphology is due to increased relative contribution in CSETN from higher-energy epithermal (HEE) neutrons that penetrate the collimator wall (Mitrofanov et al., 2011).
