Hi ! I wanted to know what is the meaning of disease and study in the following code:

library(inSilicoMerging);
esetNONE = merge(esets, method="NONE");
esetCOMBAT = merge(esets, method="COMBAT");
colnames(pData(esetNONE));
table(pData(esetNONE)[,"Study"]);
table(pData(eset_NONE)[,"Disease"]);

Any suggestions would be helpful, Thank You