Table 2
Overview of the archival data used in this work.
| Period | Number of data points | Reference |
|
|
||
| 1934−1940 | 61 | (1) |
| 1979−1995 | 134 | (2)...(13) |
| 1980−2007 | 1 721 | (14)...(16) |
| 1998−1999 | 12 | (17) |
References. (1) Griffiths et al. (1979); (2) Griffiths et al. (1979), (3) Miller & McAlister (1983), (4) Brindle et al. (1986), (5) Hamuy & Maza (1987), (6) Pica et al. (1988), (7) Treves et al. (1989), (8) Mead et al. (1990), (9) Smith & Sitko (1991), (10) Carini & Miller (1992), (11) Smith et al. (1992), (12) Jannuzi et al. (1993) and (13) Urry et al. (1993) as collected in Zhang & Xie (1996); (14) Campbell (2004), (15) Courvoisier et al. (1995) and (16) Pesce et al. (1997) as collected in Osterman et al. (2007); (17) Tommasi et al. (2001).
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