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\n Synopsis
		sfgroll < in.rsf > out.rsf begf=10. endf=5. theta=0.2 alpha=0.1 beg1=0. beg2=0. rep=n

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\n Parameters
		\n \n \n \n   float alpha=0.1 \twidth parameter of ground roll \n \n \n\n \n \n \n   float beg1=0. \tradial beginning point at first axis \n \n \n\n \n \n \n   float beg2=0. \tradial beginning point at second axis \n \n \n\n \n \n \n   float begf=10. \tbeginning frequency of ground roll \n \n \n\n \n \n \n   float endf=5. \tending frequency of ground roll \n \n \n\n \n \n \n   bool rep=n [y/n] \tif y, replace data with noise \n \n \n\n \n \n \n   float theta=0.2 \tdirection of central ground roll \n \n \n

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