Fig. 3
From: Beyond a spec: assessing heterogeneity in the unregulated opioid supply
The distribution of fentanyl concentration (w/w%) for each sample batch. Each point represents the result for an individual subsample, with the box-and-whiskers plot summarizing the distribution. The median (q50) is the horizontal line within the box. The bounds of the box represent the IQR (q25–q75), and the whiskers extend to 1.5\(\times\)IQR. Outliers are identified as outside these bounds