Fig. 1.

Parental daily means for six photosynthetic traits (see Table 1 for an explanation of trait abbreviations) over the course of the experiment (Italian, dashed line; Swedish, solid line). Day 0 measurements were taken at 21 °C prior to the start of the cold treatment; the remaining days were all 4 °C. Means were calculated by flat within batch, and then over batches. Error bars are 1 SE.