When I view the R & T files after rotation, I occasionally notice that
either the R or T file has shifted to the left, and is no longer in vertical
synchronization with the Z, N, & E files. I have had this happen several
times. When the shift occurs, it is always to the left, and only involves
one file, either the R or T file. It has never occurred on both the R & T
files. I have been unable to isolate a common denominator for this problem.