Anomalies in published distortion data for tracking and tracing error are explained as caused by contamination from other distortions. The two-channel properties of these two errors are studied to reveal ways in which they may be sharply delineated from one another and from spurious effects. A standard tracking error test is devised offering a ten-fold improvement in precision over earlier tests. Tentative results from an experimental recording indicate partial fulfillment of this offering. Several interesting tests for tracing error are proposed.
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