Fig. S1. Average diurnal CO2 concentrations at the FACE plots given as 1-h means with standard deviations for the growing seasons 2008 (a, b, c) and 2010 (d, e, f), respectively.

Table S1. Daily means (24 h) of incident photosynthetic active radiation (PAR) for a water stressed (WS) subplot with a rain shelter tent in the 2008 growing season.

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