Figure 3
From: Retrieving zinc concentrations in topsoil with reflectance spectroscopy at Opencast Coal Mine sites
Histogram and box plot of Zn concentration of the topsoil in the study area (No. of samples = 111). (Note: Rad dashed curve is the soil Zn concentration background value of Inner Mongolia Autonomous Region, dashed circle denotes the outliers of soil Zn concentration).
