346 
700 7 SO SCO 
WAVELENGTH (nm ! 
WAVELENGTH ¡nm) 
WAVELENGTH (nmi 
Figure 2. Grav level maps of the R 2 values corresponding to each set of wavebands [Xj,À 2 ]. Black level 
corresponds to R 2 = 0.0: white level corresponds to R 2 values close to 1. Graphs a, b and c correspond 
respectively to SRP1, NDPl and SIPI pigment indices. The upper diagonal matnx, corresponds to the power 
function (5). The lower diagonal matnx corresponds to the exponential function (6). The diagonal values were set 
to 0.