Probe (cell) level data from the CEL file: These CEL values produced by GCOS are 75% quantiles from a set of pixel measured in each cell.

Probe set data: The original CEL values were processed using RMA and log2 transformed using our standard 2z +8 transform. This recenters each array to a mean of 8 units and a SD of 2 units. Probe set values are typically the averages of four biological replicates within strain.