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positive number
enables you to set a maximum allowable deviation between original and resulting surfaces in the process of converting pro/engineer surfaces to spline surfaces (for example, for iges, this conversion occurs only when the iges_out_all_srfs_asoption is set to 114; for catia and vda, this conversion always occurs).
setting the maximum deviation enables you to convert surfaces with a better approximation than what you would get by using the current model accuracy.
to set the deviation, enter a positive value in the current model units. if the value that you enter is outside the acceptable range, the system uses the default model accuracy.