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LUDecomposition output?

Can someone tell me how, exactly, is the LUDecomposition output formatted?
I have a symmetric matrix which I need to decompose into a lower and an upper
diagonal matrix, but I cannot find any reference to the command itself.  
Executing LUDecomposition[ ] gives me a single table, but I do not know which 
coefficents belong to which matrix.  Any help will be appreciated.

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