Synopsis
		sfexpand > out.rsf < in.rsf left=0.5*nx right=0.5*nx top=0 bottom=0

Parameters
		int bottom=0   int left=0.5*nx   int right=0.5*nx   int top=0

Used In
		TCCS          fraclapl/marmq gmresq/bpgas onestep/bptti onestep/bptti2 sglowrank/avo sglowrank/bp3 sglowrank/tlayer3