Figure 4

Spatial relationship between concentration of Se, Mn, and As against population density in study area. (ArcGIS Desktop. 10.3. ESRI, California, US. https://desktop.arcgis.com).

Spatial relationship between concentration of Se, Mn, and As against population density in study area. (ArcGIS Desktop. 10.3. ESRI, California, US. https://desktop.arcgis.com).