for MEG sensor （magnetometer and gradiometer），How to set the direction

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hello, everyone，
if the MEG sensor direction (n1,n2,n3) is known, how to set in MNE? In MNE, the direction of raw.info[‘chs’][chs_number][‘loc’][3:12] has 9 parameter，How to convert from (n1,n2,n3) to info[‘chs’][chs_number][‘loc’][3:12]？