where a is the attenuation coefficient according to Thorp (1967).

In the RAYMODE model, user-supplied input information includes:

1 sound-speed profile;

2 source and receiver depths;

3 frequency;

4 horizontal range determinants;

5 bottom loss (default values used if inputs not supplied);

6 surface loss (default values used if inputs not supplied);

7 source and receiver beam patterns (default values used if inputs not supplied);

8 program controls (e.g. number of ray cycles to be processed, ray angle limits, mode cutoff values, calculation method options); and

9 output options.

Graphical outputs from RAYMODE include:

1 sound-speed profile plot and plots of bottom loss, surface loss and beam deviation loss;

2 source and receiver angles versus horizontal range (i.e. arrival structure) for selected ray paths (Figure 4.14);

3 travel time versus horizontal range for the ray paths in item (2) above (Figure 4.15);

4 TL verus horizontal range for coherent or incoherent combination of multipaths with beam pattern attenuation (Figure 4.16); and

5 ray trace diagram (Figure 4.17).

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