Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12302-020-00399-2/MediaObjects/12302_2020_399_Fig4_HTML.png)
a Co-occurrence of detected PSMs in between sites (18 positive samples) and b the number of samples exceeding mixture risk quotient (RQ) levels of PSMs
a Co-occurrence of detected PSMs in between sites (18 positive samples) and b the number of samples exceeding mixture risk quotient (RQ) levels of PSMs