The box plot facilitates the detection of outliers. You can conclude from this example that there does not appear to be any outliers in the N -S direction for the coal seam thickness data.

Box plots, also called box and whisker plots, are more useful than histograms for comparing distributions. They show more information about the data than do bar charts of a summary statistic such ...

Outliers beyond the whiskers may be individually plotted. Box plot construction requires a sample of at least n = 5 (preferably larger), although some software does not check for this.