NCAeqDD 1984-2021 (version NCAeqDD.v202112.1):
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# of total original events in NCSN catalog       1,068,766
# of events with waveforms                         871,662 (81.6%)
# of events with NSTA >= 6 (before relocation)     889,469
# of events relocated (NSTA>=6)                    879,627 (98.9%)
# of phase picks                                19,110,766

Correlation statistics:
# of corr events (nccP >=> 3 per pair):            721,858 (87.7%)
# of P-wave correlation times (Cf >= 0.7):             4.6 billion
# of S-wave correlation times (Cf >= 0.7):             4.2 billion

Difference between 2021 DD and initial (NCSN)
|med| (km):  DX = 0.16; DY = 0.18; DZ = 0.41
|mean| (km): DX = 0.35; DY = 0.37; DZ = 0.75
STD (km):    DX = 0.70; DY = 0.74; DZ = 1.42

Difference between 2021 and 2019 DD locations
|med| (km):  DX = 0.01; DY = 0.01; DZ = 0.03
|mean| (km): DX = 0.04; DY = 0.04; DZ = 0.14
STD (km):    DX = 0.17; DY = 0.17; DZ = 0.39

Location errors:
Median lateral rel loc err (picks) (km):   0.068
Median vertical rel loc err (picks) (km):  0.081
Median lateral rel loc err (xcorr) (km):   0.025
Mean vert rel loc err (xcorr) (km):        0.031
 
Residual statistics:
Relocated pick RMS (s):                    0.061
Relocated x-corr RMS (s):                  0.009
Relocated pick RMS *(year>2000) (s):       0.060