Synopsis
		sfboxsmooth < in.rsf > out.rsf repeat=1 rect#=(1,1,...)

Parameters
		int rect#=(1,1,...) smoothing radius on #-th axis   int repeat=1 repeat filtering several times

Used In
		BEI          fdm/kjartjac vela/stack vela/strat   GEE          ajt/cunha lsq/invstack lsq/vesuvio   RSF          tutorials/semblance   TCCS          apwd/crnfld sobel/penobscot synth/ordexample20hz