A technical model of the Martian atmosphere that gives extreme upper and lower probable limits between which must fall the atmospheric parameters of pressure, temperature, and density up to 150-km altitude over middle and low latitudes. Other parameters important to the engineering design of entry probes are tabulated. The results have a rather high confidence value. Although the values are extremely widespread, a combination of circumstances indicates that the engineering task of atmospheric entry will be easier for Mars than for any other planet. 17 pp.
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