This anneals out the dislocations (recovery) and promotes recrystallization. In each droplet, DNA template anneals to the P1-coupled bead from its A1 side. After the primer anneals, a DNA polymerase will complete the primer. Tin anneals at reasonably-low temperature as well, normalizing tin's microstructure of crystallites/grains. Unlike furnace anneals they are short in duration, processing each wafer in several minutes. From then on, there were periodic anneals to release Wigner energy. Furnace anneals are performed by equipment especially built to heat semiconductor wafers.