Table 1: Observing periods in years 2000-2002. Time periods of each year are labeled with the beginning day in Nov., bd, the end day, ed, the beginning hour and minute, bh and bm, and end hour and minute, eh and em, respectively of each particular period, in UT, and with the corresponding solar longitudes, $bL_{\odot }$ and $eL_{\odot }$ [J2000.0]. The last column indicates whether the period was considered a background (i.e. b) or shower (i.e. s) activity. These periods were the same for all 4 categories of echoes except for 2000 when also the interval from $L_{\odot} = 234\hbox{$.\!\!^\circ$ }85$ to $L_{\odot} = 235\hbox{$.\!\!^\circ$ }46$ was used as a background for echoes having $T \! \geq \! 10.0$ s.
2000
Beginning End  
bd bh bm $bL_{\odot }$ ed eh em $eL_{\odot }$ b/s
14 22 00 $232\hbox{$.\!\!^\circ$ }84$ 15 13 00 $233\hbox{$.\!\!^\circ$ }47$ b
16 $\hspace{0.6mm}$ 4 40 $234\hbox{$.\!\!^\circ$ }13$ 16 10 52 $234\hbox{$.\!\!^\circ$ }39$ b
16 22 00 $234\hbox{$.\!\!^\circ$ }85$ 17 12 23 $235\hbox{$.\!\!^\circ$ }46$ s
17 22 00 $235\hbox{$.\!\!^\circ$ }86$ 18 13 00 $236\hbox{$.\!\!^\circ$ }49$ s
18 22 00 $236\hbox{$.\!\!^\circ$ }87$ 19 13 00 $237\hbox{$.\!\!^\circ$ }50$ b
2001
Beginning End  
bd bh bm $bL_{\odot }$ ed eh em $eL_{\odot }$ b/s
15 22 00 $233\hbox{$.\!\!^\circ$ }59$ 16 13 00 $234\hbox{$.\!\!^\circ$ }22$ b
16 22 00 $234\hbox{$.\!\!^\circ$ }60$ 17 13 00 $235\hbox{$.\!\!^\circ$ }23$ b
17 22 00 $235\hbox{$.\!\!^\circ$ }61$ 18 13 00 $236\hbox{$.\!\!^\circ$ }24$ s
18 22 00 $236\hbox{$.\!\!^\circ$ }62$ 19 13 00 $237\hbox{$.\!\!^\circ$ }25$ s
2002
Beginning End  
bd bh bm $bL_{\odot }$ ed eh em $eL_{\odot }$ b/s
14 23 00 $232\hbox{$.\!\!^\circ$ }37$ 15 13 00 $232\hbox{$.\!\!^\circ$ }96$ b
17 23 00 $235\hbox{$.\!\!^\circ$ }39$ 18 13 00 $235\hbox{$.\!\!^\circ$ }98$ b
18 23 00 $236\hbox{$.\!\!^\circ$ }40$ 19 13 00 $236\hbox{$.\!\!^\circ$ }99$ s
19 23 00 $237\hbox{$.\!\!^\circ$ }41$ 20 13 00 $238\hbox{$.\!\!^\circ$ }00$ b


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