Specifies an order which is to be disabled from further processing.
The default value is zero which is ignored, in case of a mistake.
Orders are disabled by writing the 'bad value' quantity into the first coefficient of the trace polynomial. This ensures that they also appear disabled to other tasks (almost all of which will need the trace polynomials).
To re-enable an order, re-fit a polynomial to its traced path, using the task ech_fitord/echmenu option 3.
Martin Clayton