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Cross ref.
M&R shows differing beam heights and profile viewed from north and south.
So therefore cannot be highest beam point or center line east west or any single axis.
Therefore M&R seems to show beam wall abutment.
Perring correlates with M&R.
Therefore also beam/north wall abutment.
M&R shows differing beam heights and profile viewed from north and south.
So therefore cannot be highest beam point or center line east west or any single axis.
Therefore M&R seems to show beam wall abutment.

Perring correlates with M&R.
Therefore also beam/north wall abutment.