Off topic:avereps function by limma package

Question

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My expression data looks like

gene   s1    s2  
g1     2.3   4.5  
g1     4.5   2.3

I have used limma::avereps to get unique gene symbols, however, i got unique gene symbols but the expression values was not averaged. The result is like

gene   s1   s2
g1     2.3  4.5

Please do suggest me!!