Lick 3 m POLISH2 measurements of three asteroids surrounding their inversion angles over a seven-night run. Note the sudden rotation of polarization orientation ﹩{{\rm{\Theta }}}^{{\prime} }﹩ for (354) Eleonora near α ∼ 19° (bottom panel, purple points), which causes fractional linear polarization p sign to change (top panel). The expected inversion angles of the parent bodies of H, L, and LL OCs are shown at the top of the figure based on laboratory measurements of their refractive indices (N. L. Bowen & J. F. Schairer 1935; T. Nakamura et al. 2011; R. Gil-Hutton & E. García-Migani 2017). Uncertainties are generally smaller than the size of the data points.