ABSTRACT
Spectral-line asymmetries of stars on the hot side of the granulation boundary in the H-R diagram are contrasted with those on the cool side by comparing the line bisectors of 41 Cyg to those of Alpha CMi. The reversed line bisectors for stars on the hot side of the boundary are interpreted to indicate large upward-stream velocities, about -10 to -20 km/s, over a small time-averaged fraction of the surface, equal to about 10 percent. Scaling properties of the bisectors imply no differential velocities within the up-flow.