Special Products Release Inventory All maps have an associated detached PDS label file with the same name as the map file with the .lbl file extension. All maps have a .jpg file extension. The maps are as follows: Chlorine Concentration Map Chlorine Sigma Map Iron Concentration Map Iron Sigma Map Water Concentration Map Water Sigma Map Potassium Concentration Map Potatssium Sigma Map Potassium Thorium Ratio Map Potassium Thorium Ratio Sigma Map Silcon Concnetration Map Silicon Sigma Map Thorium Concentration Map Thorium Sigma Map