Relative spectral reflectance of used colours (maximum reflectance = 1, maximum illumination = 1). nm = wavelenght, hue30=orange, used only in the nest cage, hue35=used both in flight arena and nest cage (quinine in the flight arena, the difficult learning task), hue43=yellow, used both in flight arena and nest cage (sugar solution in the flight arena, the rewarding flower), flightarenablue=used both in flight arena and nest cage (quinine in the flight arena, the easy learning task), nestcageblue= blue, used only in the nest cage, floor=floor reflectance, illumination=illumination spectra, relative values (highest value=1)
