backAzimuthRange

This accepts event station pairs where the azimuth from the station to the preferred origin is within the range given in degrees.

Example 

<backAzimuthRange>
    <unit>DEGREE</unit>
    <min>30</min>
    <max>90</max>
</backAzimuthRange>

This consists of

Places this can be found

In eventStation there is a choice between all of the following