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I have download TCGA COAD expression data file which have data like shown below. How these values are calculated and what does means by these values.

Hybridization REF TCGA-AA-A00E-01A-01R-A002-07
Composite Element REF log2 lowess normalized (cy5/cy3) collapsed by gene symbol
ELMO2 -0.201
CREB3L1 2.3005
RPS11 -0.080375
PNMA1 -1.23175