Bruker Avance III-400 P31 shift error

 All Phosphorus-31 chemical shifts of samples run in C6D6 have an error! The chemical shifts are shifted downfield by 13.3560 ppm.

 There was an incorrect value in the lock shift table. This only affects C6D6 and only 31P. It affects both spectrometers, however the chemical shift error is not seen unless "sref" is done to correct the chemical shift.

This error likely existed from the time the spectrometer was installed until today, Sept 11, 2009. 

ALL SPECTRA OF 31P IN C6D6 SHOULD BE CHECKED FOR THIS ERROR!