Cumulative z-score rankings based on key metrics for all snake assemblies. Standard deviation and mean were calculated for ten chosen metrics, and each assembly was assessed in terms of how many standard deviations they were from the mean. These z-scores were then summed over the different metrics. Positive and negative error bars reflect the best and worst z-score that could be achieved if any one key metric was omitted from the analysis. Note: the SOAP assembly is sub-optimal due to use of mistakenly labeled 4 Kbp and 10 Kbp libraries (see Discussion).