C3D files with poor Force Plate data

12/18/2002  11:44 AM           315,904 2198928.c3d
06/01/2002  05:10 PM           279,040 evart.c3d

Two sample C3D files from different laboratories using different 3D systems and different force platforms.
Both C3D files contain unexpectedly noisy analog data in the force plate channels.

evart.c3d	- sample data from a Motion Analysis Corporation user.
21892.c3d	- sample data from a Vicon Motion Systems user.

Both files contain very poor quality analog data due to local lab artifacts.  The Vicon C3D file
appears to have incorrect FORCE_PLATFORM:ORIGIN information.  The Motion Analysis Corporation
file has correct FORCE_PLATFORM:ORIGIN information.