Single dust parcel trajectory starting from the same location in the envelope for all four models. Broadly speaking, time flows from the top right of the figure to the bottom left. The coloured point denotes the location of the parcel in each model at a collapse time of 120 kyr. The size of the dust particles in each collapse model denotes how quickly the dust collapses, with larger grains being farther along in their collapse than smaller grains. The different rotation rates of the clouds produces a small change in the envelope collapse, and the embedded disk grows more quickly, which causes a large change in the trajectory when the dust particle encounters the disk.