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Table 6.

Definition of colour codes of solar cycle phases (see Fig. 5).

Colour From To α factors used
Red Launch NOAA-16 (2001) Launch NOAA-18 + 6 months (2005)a α 1 N16
Green Launch NOAA-17 (2002) Launch MetOp-02 + 6 months (2007) α 1 N17
Yellow Launch NOAA-18 (2005) Launch NOAA-19 + 6 months (2009) α 1 N18,
Turquoise Launch MetOp-02 (2007) Launch MetOp-01 + 6 months (2013) α 1 M02, α 2 N17

6 months is added to the date of launch of the satellite defining the end of a period. This is because Sandanger et al. (2015) used one year of data from the new satellites to calibrate the old satellites and placed the calibration α factor in the middle of the respective 1-year period.

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