File Name : figure s1.tif

Caption : figure s1. contribution ratios (c<sub>r</sub>) of (a) first(●), (b) second (○) and third (◎) pca loadings versus effective penetration depth (d<sub>eff</sub>)

File Name : figure s2.tif

Caption : figure s2. contribution ratios (c<sub>r</sub>) of (a) first(●) and (b) second (○) pca loadings versus effective penetration depth (d<sub>eff</sub>)