The absorption opacity as a function of wavelength for Draine silicates with size distribution power law scaling as |$q=-3.5$|⁠. Different lines are for different maximum grain sizes of the grain-size distribution (which we refer to as |$s_\textrm {entr}$| since locally that maximum size will be the largest entrained grain size). The vertical dashed line is 0.1|$\mu$|m, at which we calculate |$\sigma _{\textrm {FUV}}$|⁠.