Fig. 3From: Verifying the feasibility of using Hand-Held X-ray fluorescence spectrometer to analyze Linqing brick: evaluation of the influencing factors and assessing reliabilityRegression of HH-XRF measurements against ICP-OES analysis. Deming relationship (solid red line) and 1:1 (dashed black line) are shown in each plot. X error bars = 5%, Y error bars = 5%Back to article page