Comparison of transcription levels estimation. A. Scaterplot of the number of 454 FLX reads used in the assembly of a given contig versus the number of Illumina reads mapping on the same contig. R1 and R2 stand for the correlation coefficients before and after disregarding the points that exhibit an extreme discrepancy between the two technologies (those ones forming an almost vertical line on the rightmost part of the figure). B. This figure depicts a depth profile showing the reads that map on a given genomic region. The upper part corresponds to 454 FLX, Illumina reads appear in the middle and the last part corresponds to the graphical representation of the corresponding genomic region.