1           1981-04-02.31  Haupt (1982) 
 2           1981-05-31.24  Harris et al. (1992) 
 3           1994-04-13.04  Lagerkvist et al. (1995) 
 4           1994-04-15.05  Lagerkvist et al. (1995) 
 5           1994-04-16.02  Lagerkvist et al. (1995) 
 6           2007-03-11.00  
 7           2007-03-11.95  
 8           2007-03-12.95  
 9           2007-03-13.98  
10           2007-04-05.92  
11           2007-04-08.88  
12           2007-04-12.98  
13           2007-04-14.91  
14           2007-04-14.99  
15           2007-04-15.08  
16           2007-04-16.99  
17           2007-04-17.92  
18           2007-04-18.94  
19           2007-04-18.97  
20           2007-04-20.99  
21           2007-04-21.92  
22           2011-03-21.25  
23           2011-03-22.26  
24           2011-03-23.23  
25           2011-03-24.23  
26           2011-03-28.23  
27           2011-04-01.21  
28           2011-04-09.23  
29           2011-04-23.21  
30  1998-02-14--2012-03-30  Lowell