20 static constexpr float NaN = std::numeric_limits<float>::signaling_NaN();
28 float daughter_parent_hit_ratio = NaN;
29 float ndaughters_hit_3d = NaN;
32 float charge_end_fraction = NaN;
33 float charge_fractional_spread = NaN;
36 float diff_straight_line_mean = NaN;
37 float line_length = NaN;
38 float max_fit_gap_length = NaN;
39 float sliding_linear_fit_rms = NaN;
42 float angle_diff_3d = NaN;
45 float secondary_pca_ratio = NaN;
46 float tertiary_pca_ratio = NaN;
49 float vertex_distance = NaN;
52 float track_score = NaN;
True particle coming out of a probe particle's interaction w/ detector.