Synopsis
		sfintervalVTI < vn.rsf > vn_out.rsf vH_out=vh_out.rsf eta_out=eta_out.rsf eta=eta.rsf interval=y

Parameters
		string eta= input eta(auxiliary input file name)   string eta_out= output eta(auxiliary output file name)   bool interval=y [y/n] output are interval [y] or effective [n] profiles   string vH_out= output HOR vel(auxiliary output file name)

Used In
		MILANO          taupvel/synth