Figure 1. Input options of the application

3. Alternatively, the User may apply interactively spatial filtering by clicking in the "Select events from map" tab (depicted by the upper in Figure 1). This option grants to the User the possibility to select data, spatially constrained
by a predefined shape (numbers 2-4 in Figure 2):

1. No draw option.
2. Draw a polygon.The User may select data into a polygon drawn after clicking on different points of the map. To close the polygon, the User has to double click on the last point, such that this point will be connected with the first one.
3. Draw a rectangle. To select data into a rectangular the User has to click on a point of the map and move the cursor to any direction. A second left mouse button click will restrict the selected area at its current state.
4. Draw a circle (option demonstrated in Figure 2). To select data into a circular the User has to click on a point of the map and move the cursor to any direction. A second left mouse button click will restrict the selected area at its current state.
   Note that the first click on the map defines the circle's center.

Figure 2. Interactive selection of data

4. As soon as the filtering criteria have been defined, the User shall click on the button (green button at the bottom of Figure 1) to apply the those criteria. The User may also select the tab (indicated by the green frame, at the bottom of Figure 1) in order to view an illustration of the events from the original catalog (red circles) and the events included in the filtered catalog (green circles). A new catalog ('catalog.mat') has been created and it is available for any further processing. In addition the system provides all the information and applications that are valid for the original catalogs (see "AH Episodes" Chapter, for details).

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