Selection Algorithm
No synthetic	40.78 ± 1.29
Center matching	53.39 ± 0.37
DS3	57.47 ± 0.87
Random	54.14 ± 0.82
Text matching	53.39 ± 0.99
Covariance matching Ours	57.52 ± 0.36
Real upper bound	62.67 ± 0.65