Figure 2. Plot showing modeled grass heights (mean line and 95% confidence intervals) and raw data (points) for the phytometers (A)Andropogon gerardi , (B) Schizachyrium scoparium , (C)Bromus inermis , and (D) Pascopyrum smithii grown in their home or away (Juniperus virginiana ) soils. The shaded areas illustrate 95% confidence intervals. Modeled means and confidence intervals are derived from the output of generalized additive models of log10(height) as a function of the interaction between the factors soil sterilization status and conditioning soil type and the smoothing variables days of growth , days of growth given the interaction of treatment factors , and the random intercept of pot ID for each plant. Grasses grown in live or sterile soils are indicated by red or blue coloration, respectively. Species names within each subfigure are abbreviated as follows: A. gerardi (ANGE), S. scoparium (SCSC), B. inermis (BRIN),P. smithii (PASM), and J. virginiana (JUVI).