Appendix G. Maps showing the individual component values and overall combined values in the human-threat index (HTI) for each of Aquatic Ecological System in Missouri. The 11 metrics were combined into the three-number HTI. (A) The first number, reflecting the highest ranking across all metrics. (B) The last two numbers, reflecting the sum of the 11 metrics (range: 1114). (C) The combined three-digit values for the HTI.