Fig. 4: Spectral characteristics and removed enveloped reflectances of mold-affected and non-mold-affected backgrounds in different regions.

The green double-arrow lines denote the boundary line. (Note: Renf signifies the removed enveloped reflectance.) a Region1; (b) Region 2; (c) Region 3; (d) Region 4; (e) Region 5; (f) Region 6.