Specifies that interactive arc line identification is required.
Many options are available in this mode to allow the tuning of the fitted wavelength polynomial, addition and deletion of features etc.
If ID_INTERACTIVE is FALSE then the ECHOMOP will try to identify arc line features automatically. For orders with enough features (>12 lines) this will usually be successful.
A useful strategy is often to do an automatic run first, and then manually examine the fitted features to verify their suitability.
Martin Clayton