{'fraction_non_alphanumeric': 0.03430749682337993, 'fraction_numerical': 0.03939008894536213, 'mean_word_length': 4.253333333333333, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Mars Global Surveyor Bistatic Radar Probing of the MPL/DS2 Target Area

Abstract Mars Global Surveyor bistatic radar was used to probe the Mars Polar Lander and Deep Space 2 target areas (76°S, 195°W) in May 2000. The behavior of quasi-specular echoes at wavelength λ=3.6 cm indicates that the top few centimeters of regolith are similar in their reflecting properties everywhere along a track of approximately 1000 km which crosses the MPL/DS2 area. Our provisional estimate of surface dielectric constant e∼2.25 is consistent with loose soil, moderately packed H 2 O snow, solid CO 2 , or a mixture of at least two. But other data rule out both H 2 O and CO 2 near the surface in late southern summer ( L s =351°), leaving dry soil with density ∼1.4 g/cm 3 as the most likely material.