FIG 4.

Box-and-whiskers representation of log-transformed values of protease activities of the 55 Suillus strains treated with four different protease inhibitors. Different letters indicate significant differences among treatment soil type means as determined by post hoc Tukey HSD tests. The boxes represent the 2nd and 3rd interquartile ranges; the horizontal lines in the boxes represent the median; the upper and lower bars outside the boxes represent the 1st (Q1) and 4th quartiles, respectively; and the dots outside the bars represent the outliers (defined as values outside 1.5 times the interquartile range below Q1 and above Q3).