Selection Algorithm
No synthetic	40.78 ± 1.29
Center matching	53.96 ± 1.06
DS3	53.51 ± 0.31
Random	49.84 ± 1.32
Text matching	53.37 ± 0.72
Covariance matching Ours	53.07 ± 0.89
Real upper bound	62.67 ± 0.65