The GRE scores of your competitors
Below is a pdf provided by the ETS website. It details the distribution of scores within the intended graduate major field based on seniors and non-enrolled college graduates between 2005 and 2008. In other words if you are a chemistry major it tells you what the distribution of other chemistry majors is. Thus, you can get a general idea of what your competition is getting since you'll probably be competing against others in your field in the application process.
gre_0910_guide_extended_table4.pdf
Cheers!
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