Synopsis
		sfswell < in.rsf > out.rsf den=10. inten=0.1 slope=0.1 width=4 length=30 num=5 rep=n noise=n

Parameters
		float den=10. noise density (percent, default=10, Min=0, Max=100)   float inten=0.1 noise intensity (multiple peak value of data, default=0.1)   int length=30 max noise length (default=30)   bool noise=n [y/n] if y, output noise only   int num=5 noise number (default=5)   bool rep=n [y/n] if y, replace data with noise   float slope=0.1 noise slope (default=0.1)   int width=4 max noise width (default=4)