National Water-Quality Assessment (NAWQA) Project
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U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999
Figure 5. Hypothetical plots as examples of (A) boxplots and
(B) concentration distribution plots. In Figure 5B,
the values on the y-axis show the percentage of monthly median concentrations
greater than the value indicated on the x-axis. For example, 68 percent of
monthly median concentrations of compound A were greater than 0.01 micrograms
per liter, and 6 percent of monthly median concentrations were greater than
1 microgram per liter.