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This was done by the same nurse assessing the patient using each of the scales sequentially at the same evaluation visit . " The preliminary assessment of the gamma-ray spectrometer data indicates the likely presence of hydrogen in the upper few feet of the martian surface as sampled at spatial scales approximately 400 miles across . But so soon as that powerful operation of it was taken off my heart , that other about Esau returned upon me as before ; so my soul did hang as in a pair of scales again , sometimes up and sometimes down , now in peace , and anon again in terror . Comparing the view by transmitted and reflected light shows that the iridescence is a result of light interference and / or diffraction with microstructure on the scales rather than by pigments . " The preliminary assessment of the gamma-ray spectrometer data indicates the likely presence of hydrogen in the upper few feet of the Martian surface , as sampled at spatial scales approximately 400 miles across . The PGMR resistance scales inversely with cross sectional area in such structures .