∆¹³C results.

<p>The ∆¹³C values for wheat grain (105 samples from 8 sites) are mostly between 16.2‰ and 17.7‰ (mean ±1σ). In terms of the water status framework based on stable isotope analysis of present-day crops [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0127085#pone.0127085.ref015" target="_blank">15</a>], this range encompasses moderately watered crops (>c.16‰) and well-watered crops (>c.17‰).</p><p>∆¹³C results.</p

∆¹³C results for pulse seeds.

<p>Dashed lines indicate the suggested 'boundaries' between ∆¹³C ranges indicative of lentils grown under poorly (low ∆¹³C), moderately, and well (high ∆¹³C) watered conditions, based on the analysis of present-day crops [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0127085#pone.0127085.ref015" target="_blank">15</a>]. ● = lentil (Lens culinaris), ◆ = pea (Pisum sativum), ▲ = bitter vetch (Vicia ervilia).</p

∆¹³C results for cereals grains from Tell Brak samples grouped by chronological period.

<p>Bars indicate means and standard deviations. <b>○</b> = glume wheat and <b>◇</b> = barley.</p

Difference between mean ∆¹³C for barley grain and mean ∆¹³C for wheat grain at each site.

<p>Dashed lines indicate the ∆¹³C difference predicted if two-row barley (at +1‰) or six-row barley (at +2‰) were grown with the same water availability as wheat, based on the analysis of present-day crops [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0127085#pone.0127085.ref015" target="_blank">15</a>].</p