Within-assembler correlation of the RSEM-EVAL and KC scores on the strand non-specific single-end data sets. Scatter plots are shown for the simulated (top row) and real mouse (bottom row) data sets and for the Trinity (left column), Oases (center column) and SOAPdenovo-Trans (right column) assemblers. Trans-ABySS was omitted because it had only one assembly. Spearman’s rank correlation coefficient (bottom-right corner of each plot) was computed for each combination of data set and assembler. KC score, k-mer compression score.