Untraceable

Summary

The program could not trace the order at all.

Check that:

• the correct frame is being traced.
• the frame is oriented so that the orders run with the dispersion direction parallel to the X-axis of the frame.

If tracing is being attempted using a cosmic-ray-contaminated frame then try using the option/task ech_decos1 to clean the frame prior to tracing.

The parameter TUNE_MXSMP determines the number of sampled increments across the frame and thus their separation. In general, increasing TUNE_MXSMP will assist the program in tracing difficult orders. It is worth experimenting with the various modes of tracing (set by the TRACE_MODE parameter). Usually, at least one of the available options will handle difficult or unusual cases.

As a last resort a manual-trace mode, in which points specified using a graphics cursor are used as the basis for the tracing process, is available.