Table 5: Measured data at SPGF1.

Series name Record date and time (record length) _spgf1_1996() 0:00, 1 Jan.–23:00, 15 Dec. 1996 8616 _spg1_1997() 0:00, 6 Mar.–23:00, 15 Dec. 1997 7080 _spg1_1998() 0:00, 1 Jan.–23:00, 7 Jan. 1998 168