1 2 3 1 _ _ _ 2 _ _ _ 3 _ _ _ ACROSS 1) the use of nuclear magnetic resonance of protons to produce proton density images 2) a fractional monetary unit of japan and indonesia and cambodia; equal to one hundredth of a yen or rupiah or riel 3) a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on earth by computing the time difference for signals from different satellites to reach the receiver DOWN 1) white crystalline compound used as a food additive to enhance flavor; often used in chinese cooking 2) informal abbreviation of `___resentative' 3) an agency in the department of justice that enforces laws and regulations for the admission of foreign-born persons to the united states ** Scroll down for solution. ** Are you sure you want to peek? mri sen gps