Fig. 3.

The spectral reflectance measurement results of all moss rubber materials. The left axis shows the spectral reflectance $\mathbf{R}$ given in percentage to a well-defined Lambertian reflector in nadir incidence ($\mathbf{\theta }=0{}^{\circ }$) whereas the lower axis gives the incidence angle $\mathbf{\theta }$ set at the measurement device in degrees.