The information in these data categories relates to the equation of motion of a diffracting structure in regular waves.

For Aqwa-Line, the input specifies a range of frequencies and directions at which these parameters are to be calculated.

For Aqwa-Drift/Fer/Librium/Naut, these parameters are read from backing file automatically or are input manually.

Note that, although the parameters calculated by Aqwa-Line can be transferred automatically to other programs in the Aqwa suite, this is not mandatory. This means that if the backing file produced by an Aqwa-Line run is not available, e.g. Aqwa-Line has not been run previously, or the user wishes to input parameters from a source other than Aqwa-Line, he may do so in these data categories.

These parameters usually remain constant for an analysis of a particular structure. This means that once the values of the Radiation/Diffraction analysis have been calculated or input, these data categories must be removed, as the information will be contained in a backing file and will be read automatically.