A single curve plots the absorbance (y-axis, 0.0 to 1.0 in steps of 0.1) of a dye solution against wavelength (x-axis, 400 nm to 700 nm in steps of 25 nm). The curve rises from an absorbance of 0.15 at 400 nm to a single rounded maximum of 0.92 at 525 nm, then falls to 0.10 at 700 nm.