Fig. 4
Boxplots showing the distributions of L*, a*, and b* values (A-C, respectively) at each roast milestone for all seven roast profiles and three coffee origins. The bottom and top edge of the boxes represent the 25 and 75th percentiles, respectively, the line inside the box represents the median, and the whiskers denote the range of the observed values. Lowercase letters indicate statistically significant differences among roast milestones according to Tukey HSD test.
