HOW TO RUN THE PROGRAM

There are three programs:

1. Compile curve1.cc
	c++ natspline.cc -o natspline

INPUT FILE STRUCTURE (e.g. nat1.in)

361				Num of points	
0.000000	25.000000	List of points

. . . 

-0.003280	24.943607	361 points
1				1 = closed curve; 0 = open

2. Run the program
	natspline < nat1.in > nat1.out

3. load output file in gnuplot
	plot "nat1,out" u 1:2 w l
	save "nat1.gif"