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The intensity of radiation received by the multispectral scanner from a given element of the Earth 's surface is influenced primarily by the reflectance of the surface and the Sun angle . " Alice " also wants the audio to be received by herself and " Bob " from the original conference , but wants any outgoing audio from herself to be restricted to the participants in the sidebar , whereas " Bob 's " outgoing audio should go to the main conference , so that both " Alice " and the customer " Carol " hear the same audio from " Bob " . " As well as the database , the team have also transferred the old copies of the magazine onto microfilm ensuring that the detail will be preserved , as original paper copies become increasingly rare and fragile . However , other factors such as the angle or slope of the surface and the amount of atmospheric haze or cirrus clouds over the surface influence the intensity of received radiation . Similarly , all of the locks on the canal , in the 50s , were converted from locks , which permitted barge traffic , to flow-control structures , which permitted the management of the water for the purposes of water supply . Prospector detected the equivalent of 11 million to 330 million tons of ice - however , because the signal from the spectrometer only can penetrate half a meter into the lunar surface , and scientists believe that ice could exist to a depth of 2 meters , there could be as much as four times that amount actually present .