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ADIS16445 factory calibration alignment

I am currently designing the mechanics for a device that is going to use the ADIS16445, I need to know what part of the sensor body are the internal measurement axes parallel to so that it's aligned correctly.

When the ADIS16445 is factory calibrated what surface is used as the reference plane?

Is it the plane formed by these 2 lines:


Or, to put it differently, after calibration what plane are the measurement axes parallel and perpendicular to (with Point of Percussion Alignment enabled, MSC_CTRL[6] = 1)?