1. Directly from data			
Make a histogram with one bar per year.			
Height of bar = percent below poverty line that year.			

	percent of US population below poverty line		
1960	22.2		
1961	21.9		source: US Census Bureau
1962	21		
1963	19.5		
1964	19		
1965	17.3		
1966	14.7		
1967	14.2		
1968	12.8		
1969	12.1		
1970	12.6		
1971	12.5
1972	11.9
1973	11.1
1974	11.2
1975	12.3
1976	11.8
1977	11.6
1978	11.4
1979	11.7
1980	13
1981	14
1982	15
1983	15.2
1984	14.4
1985	14
1986	13.6
1987	13.4
1988	13
1989	12.8
1990	13.5
1991	14.2
1992	14.8
1993	15.1
1994	14.5
1995	13.8
1996	13.7
1997	13.3
1998	12.7
1999	11.9
2000	11.3
2001	11.7
2002	12.1
2003	12.5	
2004	12.7	
2005	12.6	



2. After some manipulation.		
Make a histogram where each bar is a gap length.		
Height of bar = number of gaps of that length.		

Interval lengths		"source: Peter Dunn, http://www.sci.usq.edu.au/staff/dunn/Datasets/"
12		
2		
6		
2		
19		
5
34
4
1
4
8
7
1
21
6
11
8
28
6
4
5
1
18
9
5
1
21
1
1
5
3
14
5
3
4
5
1
3
16
2