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Tire Force and Moment Reporting

From A/Chassis, I am referring Req/1051~43 for Tire Force & Moment data from vehicle data set. When I checked these Lateral Forces at 4 corners during a constant radius, they were shown as sine-wave-like oscillation around zero-value with a sizeable magnitude equivalent to a given slip angles.  (same for Fx, except values for z-axis) I believe this is caused from these F&M values are being reported with a global reference marker... not a vehicle-fixed marker like a CG.  Any thought on this? And what to do if F&M data is wanted to be reported in vehicle orientation? (No source code of Req/Subroutine is open to public.)      
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