Grain properties as a function of the parameters A_max and γ of the grain size distribution for the J and K bands and for the ratio J∕K. The panels show the asymmetry parameter g; albedo α; and the scattering, absorption, and extinction efficiencies Q_sca, Q_abs, and Q_ext, respectively. The plot corresponds to r_Si = 0.5, and the colour bars show the values of the dust parameters.