	FITZ fits smooth curves to a surface of data points. 
	e.g. Given some data points, e.g.

x	y	z
---- data file testf.dat -----
1 	1 	1
1 	2 	1
2 	2	1
2 	1	1
1.5 	1.5 	2
------------------------------

	These points defile the for corners of a surface which has 
	one high point in the center.  As you can see the order of 
	points is not relevant.

	It is important that each line of the data file has three
	points on it. (x, y, z)

	FIT then asks you for a range of x and y values generate z values
	for.  The range is given as minimum,maximum,stepsize.
	e.g.		1,3,.5	would produce 1, 1.5, 2, 2.5, 3

	Use SURF to draw the surface on the screen and see the finished 
	product.

$ FITZ 
Data file conaining x y z data ? TESTF.DAT
Read 5 points from file {testf.dat} 
Will write data to {testf.z} 
Number of points to use for contouring each point ? [3] 
Range of output x values [1,2,6.666667e-02] ? 1,2,.05
Range of output y values [1,2,6.666667e-02] ? 1,2,.05
nx 21, ny 21, Work space iwk=2384 bytes wk=160 bytes 
Y = 1 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 
1.7 1.75 1.8 1.85 1.9 1.95 2 
$ 

	Now use TESTF.Z as your data file for SURFACE.
