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tramadol hcl acetaminophen car "The time of return of various echoed signals tells you how deep things are. The shape and polarization of the returning signal tells you what types of materials are encountered," Lee said. "If different sounding frequencies are available on the GPR, which seems to be the case on the Chinese rover, the higher frequencies are used for probing to shallow depths while the lower frequencies, longer wavelength, are used to probe to greater depths," he said.