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Correlation of IgM measurements between Salmonella Typhi antigens. Histograms show the distribution of IgM levels by optical density to all purified S. Typhi antigens. The scatterplots below the histograms plot the IgM measurements of the two antigens on a right angle to the histograms and describe the correlation between antibody responses to two selected antigens. The numerals above the histograms depict the Spearman correlation coefficient (rho) values of the mirrored scatterplot.
