Antenna phase center

I’m trying to obtain the phase center offset for a third party gps antenna for use with my M2. The model number is Beitian 300S. I attempted to contact the manufacturer without success. I did obtain calibration files from NOAA for this model, but I don’t know how to interpret them. Can anyone assist or send me in the right direction? I have included the calibration files below

ANTINFO.pdf (38.2 KB)
ANTEX.pdf (43.1 KB)

NGS is using 61.74mm vertical to phase center.

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It is 61.7 mm for L1 frequency and 51.8 mm for L2 frequency. Practically, you can use the mean, 56.75 mm.