Fraction of particle mass-loss for simulations with different volume filling factors and exponential fits to the data points for the case of an intimate dust-ice mixture of 40 % dust and 60 % ice volume for a reduced sublimation depth of the largest monomer diameter. The dashed curve is the fit to the data according to Eq. (2), whereas the dotted curve is the fit of the corresponding simulations with the standard evaporation depth.