Scale Lambda for count setting for spline smoother in graph builder in JMP18

[#1]

I noticed that some of my reports were getting totally messed up due to spline smoother looking weird. After a lot of tinkering I come to conclusion that my X-group seemed to be affecting my smoother. From that a lot more looking around what is going on until I finally came across new settings "Scale lambda for count" which can be found from Spline smoothers red triangle menu

Couldn't find it mentioned in Smoother documentation for Graph Builder Smoother (jmp.com) (or any other mentions about this).

Example script to quickly test this behaviour

Names Default To Here(1); 

dt = open("$SAMPLE_DATA/Big Class.jmp");

nw = New Window("Demo",
	Data Filter Context Box(
		Tab Box(
			Tab Page Box("Filter",
				dt << Data Filter(
					Local,
					Add Filter(columns(:age), Display(:age, N Items(6)))
				)
				, << Set Base Font("Title")
			),
			Tab Page Box("No Scale",
				gb1 = dt << Graph Builder(
					Show Control Panel(0),
					Variables(X(:weight), Y(:height), Group X(:age)),
					Elements(
						Points(X, Y, Legend(9)),
						Smoother(X, Y, Legend(12)) // default 0...
					)
				)
				, << Set Base Font("Title")				
			),
			Tab Page Box("Scale",
				gb2 = dt << Graph Builder(
					Show Control Panel(0),
					Variables(X(:weight), Y(:height), Group X(:age)),
					Elements(
						Points(X, Y, Legend(9)),
						Smoother(X, Y, Legend(12), Scale lambda for count(1))
					)
				)
				, << Set Base Font("Title")				
			)
			, << Set Style("Horizontal Spread")
		)
	)
);

JMP18 (default on left, Scale Lambda for Count set as 1 on right)

JMP17

Which of the two options is closer to what JMP did earlier? 

[#2]

Interesting!  I didn't notice that added option ( I was so excited about the ability to use summary statistics with the smoother!).

It looks like using counts get you the closest but really seems like JMP 17 is between the two options for JMP 18.  Seems like there should be documentation if something changed in the base smoother fit......