Figure 2: Pareto performance frontier for the 97 considered Arabidopsis accessions.

(a) The condition-specific normalized fresh weight (FW) and protein concentration provide the coordinates for the vertices of an accession-specific triangle, for example, for Je-54. The larger spread of FW in comparison to protein concentration is due to its nonlinear relationship to the relative growth rate. The average performance with respect to the two tasks across all three conditions is provided by the centroid of the triangle. The centroid is used as a representative of an accession, and the size of the associated point is proportional to the size of the respective triangle. The colour coding of the three lines incident on each centroid denotes the conditions, red for OpN, yellow for LiN and blue for LiC. The lines are directed towards the vertices of the corresponding triangle. For clarity, the vertices of the triangles are omitted from the plot. The dashed line approximates the Pareto performance frontier. (b) The histogram of accession-specific triangle areas for the three considered conditions suggests the presence of three groups of accessions: those performing similarly under all conditions (small triangle area), those differing in one condition (average triangle area) and those divergent in the three conditions (large triangle area).