(a) Linear transformation of NSDP virus geometric mean ID50 neutralization titers provides a tiered scale, based on previous reports. Symbol colors indicate neutralization sensitivity, from ranked virus mean ID50s, and range from most (red) to least sensitive (grey). Envs identified for use in candidate subset panels that reproduce full virus panel NP values are labeled, with corresponding symbols colored black. We use the transformed values to compute serum NP. (b) Serum NPs are correlated with geometric mean ID50s per serum but, because of the transformation applied to viruses, range from about 1 to 4, consistent with the established Env tier classification scheme. Symbol colors show potency among ranked mean serum ID50s, and range from least (grey) to most potent (blue). Other colors indicate results from χ2 tests for non-zero slope, with Bonferroni corrections for 205 tests (red, experiment-wide p>0.1/205, that is per-comparison p>0.000488; magenta, experiment-wide p>0.05/205, per-comparison p>0.000244).