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. Author manuscript; available in PMC: 2017 Aug 8.
Published in final edited form as: Icarus. 2015 Jul 15;255:100–115. doi: 10.1016/j.icarus.2015.04.004

Fig. 8.

Fig. 8

Putative artifact signal due to undiagnosed operational factors. (A) Suppressed neutron sensitivity near dawn, decaying with time, exaggerates hydrogen near dawn. Similar effect at ±12 h local time, due to short orbit period, exaggerates hydrogen in afternoon as well. (B) Enhanced neutron sensitivity in afternoon leads to nondetection of hydrogen in afternoon and pre-dawn and exaggerates hydrogen post-dawn and post-dusk. (C) Insolation effect on spacecraft (blue) that exaggerates detection of hydrogen post-dawn also exaggerates sensitivity pre-dusk. Lack of insolation on nightside leads to nondetection of hydrogen. Enhanced neutron sensitivity at noon would lead to similar pattern but with constant false hydrogen detection on nightside as well (turquoise). (D) Insolation that suppresses neutron flux when anti-lunar side of spacecraft is illuminated results in false detection of hydrogen at subsolar point.