Day-by-day expression levels for a genomic region show the linear effect. Fitted log2 intensities per time point of the genomic region of gene AT1G62500 on the forward strand of chromosome 1. The different replicates are indicated by ∘, + and , while the different days are represented by different colors: black (D8), red (D9), green (D10), blue (D11), cyan (D12) and magenta (D13). The grey rectangles indicate the detected regions showing a significant mean expression. The decreasing trend of the fitted log2 intensities over the different time points exemplified in Figures 2 and 3 is clearly apparent in this figure.