Top: ratio between opacities at 1300 and 5500 Å for silicate (blue) and iron (red). solid lines correspond to ratios of total opacity, dashed lines correspond to ratios of scattering opacity. values smaller than one could cause shallow UV transits. Bottom: ratio of the phase function at 1300 and 5500 Å for astronomical silicate (blue) and iron (red). calculated for the scattering angle zero, i.e., for the forward scattering. values larger than one might also cause shallower UV transits.