Slope parameter (S_OE) based on manual extraction from image. The first column (top left and bottom left panels) is the relation between I∕F and S_OE for Domain I, and the second column (top right and bottom right panels) is that for Domain II. I∕F is the representative value for an average of two images in each band and each set. Square symbols correspond to data from Set 1, while circles represent Set 2 data. Different colors coincide with the different bands of AMICA.