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x-axis = fraction of respondents who tried a given treatment
y-axis = average rated effectiveness of a given treatment
vertical blue line = average fraction of respondents who tried each treatment
horizontal blue line = average rated effectivenss of all treatments
Treatments in the upper-left quadrant have below-average usage, but above-average effectiveness, so presumably more people should be trying these. Those in the lower-right quadrant have above-average usage but below-average effectiveness, so presumably fewer people should be using these.