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Fig. 1. Comparison of observed and calculated days to first flower for natural and artificial light. Observations were averaged over replications. Each point represents one isoline-location-year. Calculations are based on the isoline-based model (Eq. [1] through [6]) with (a) using the original model by Cober et al. (2001), (b) the original model modified by inserting the photoperiod limit (PM), and (c) the original model modified with PM plus two sets of photoperiod coefficients.
