MP08 comparison case. Left panel: timescale of growth by differential settling/coalescence (blue solid line) and Brownian coagulation (green dash-dotted). These timescales are by construction equal to the associated settling timescale. The timescale of gas advection is shown by the brown dashed line. In this atmosphere, the evaporation timescale of the grains is always many orders of magnitude longer because of the low temperatures. The thin gray dashed and dash-dotted lines show the result if the velocity of the gas is directly included to calculate the growth timescales of differential settling and Brownian coagulation, respectively (Appendix C). Right panel: ratio of the stopping to the settling timescale RSS (solid) and stopping timescale (dashed line) of the grains.