Regression parameters of a three-parameter sigmoid model^a (<i>y</i> = <i>a</i>/{1 + exp[-(<i>x</i>–<i>d50</i>)/<i>b</i>]}) fitted to <i>Avena fatua</i> and <i>Avena ludoviciana</i> plant height, tiller and leaf number per plant at different soil moisture levels.

Regression parameters of a three-parameter sigmoid modela (y = a/{1 + exp[-(x–d50)/b]}) fitted to Avena fatua and Avena ludoviciana plant height, tiller and leaf number per plant at different soil moisture levels.