Extended Data Fig. 5: Fit of combined data for each plasma dilution to a normal distribution.

The function normplot in MATLAB v.2019b was used to assess the fit of the data (blue crosses) to a normal distribution (solid red line). For each plot, one data point is the Tx result for one experiment for one participant at the specified dilution. The number of total experiments per viral variant was n = 42 for first-wave plasma and n = 21 for second-wave plasma. Lack of pronounced curvature of the data in the range of the solid line indicates that the data are a reasonably good fit to a normal distribution. See https://www.mathworks.com/help/stats/normplot.html for additional information.