Fig. 4. Environmental samples of mussels collected monthly from central San Francisco Bay for April to September 2015. Boxes are the 25th and 75th percentile, and whiskers indicate 1.5 IQR. Dots are statistical outliers, blue squares are the means, and the black dotted line indicates the OEHHA action level for fish at 10 ng/g. Bars and outliers are colored via the following scheme: levels of toxin 10 ng/g are bright red. The outliers also follow that scheme, so just the > 10 ng/g outliers are bright red.