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Table 1

Complete log of observations of BL Lac.

Date (dd.mm.yyyy) Filter No. of data points Duration (h)

26.05.2011 BR 1  ×  2 0.2
27.05.2011 BR 1  ×  2 0.2
31.05.2011 BR 81  ×  2 3.3
01.06.2011 BR 96  ×  2 3.1
02.06.2011 BR 129  ×  2 2.7
03.06.2011 BR 29  ×  2 0.8
04.06.2011 R 191 3.6
06.06.2011 BR 173  ×  2 3.7
08.06.2011 BR 1  ×  2 0.1
11.06.2011 BR 1  ×  2 0.1
12.06.2011 BR 1  ×  2 0.1
13.06.2011 BR 72  ×  2 3.7
17.06.2011 BR 48  ×  2 3.1
24.06.2011 BR 1  ×  2 0.1
25.06.2011 BR 1  ×  2 0.1
03.07.2011 BR 1  ×  2 0.2
08.07.2011 BR 197  ×  2 5.5
09.07.2011 BR 167  ×  2 5.6
31.07.2011 R 4 0.4
03.08.2011 BR 52  ×  2 2.1

Total 20 nights 2299 38.7

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