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This article has an erratum: [https://doi.org/10.1051/0004-6361/201220824e]


Table 5

Data point colours used to mark different observing runs in Figs. 7, 8, 9, 11 and 12.

Dates Colour

20041004–20041005 Black
20060801 Red
20070804–20070805 Blue
20070904–20070905 Cyan
20090107–20090108 Magenta
20120628–20120629 Green

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