Fig. 6. Plot for predicted concentrations of the ten studied agrochemicals as a function of
the nominal values in fungus (circle), crisphead (square) and butter (diamond) lettuces,
alfalfa sprouts (triangle up), cucumber (triangle down), and celery (hexagon) samples
(error bars correspond to duplicates). The inset shows the corresponding elliptical joint
region at 95% confidence level. The cross marks the theoretical (intercept = 0, slope =
1) point.