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The passive seismometry had recorded a series of minor events and withstood temperatures of up to 364 kelvins (195 degrees F). The average temperature in the central station reached 361 K (190 degrees F) at solar noon on July 27 and dropped to 243 K (157 degrees F) on July 31. MSC appointed a study group to investigate the causes of the higher than predicted temperature levels. Lick Observatory in California successfully acquired beams from the laser retroflector on August 1 and was continuing ranging activities.