Movie S4.

Density threshold animation of crown Crown density threshold (contour level) is increased from level 4.2 to 6.2 and reverted back to 4.2 to show the highest density crown features, particularly the apical to basal lobe interface that is retained even at the higher 6.2 contour level. At higher threshold the side connections between apical-apical and basal-basal lobes disappear.