Depending on the type of geophysical data, array increments may represent time, distance, velocity, or other parameters. Select the appropriate base type that aligns with your processing goals. Once selected, the label at the top of the dialog will update, indicating the array size.

Available base types include:

• None: No base property is assigned.
• Energies: Define the value of the first array element and the increment. The table below updates to show index-to-energy mapping.
• Frequencies: Enter specific frequencies for each array element. These are tabulated dynamically (i.e., displayed in the dynamic table at the bottom of the dialog).
• Time windows (Contiguous): Define time gates using consecutive widths. You can use shorthand syntax n x m to repeat a width m for n times. If fewer widths are provided than array elements, the final width is applied to the remaining array elements. The dynamic table displays the time widths (Width) and the centre value of each time gate (Time). See Figure 1.
• Time windows (Discrete): Define each time gate using explicit start and end times. Gates may overlap (i.e., the end of one time gate may overlap with the beginning of the next). These values are listed in the dynamic table. (See Figure 2.)

Specifying units is optional. The drop-down list is populated based on the selected Base type.

This field is context-sensitive and reflects the nature of the Base parameter. It defines the offset to the first array element, which may not start at zero. This value—whether Initial value, Delay time, or Base frequency—is stored in the data array header.

The label is contextually set relative to the Base parameter. You can enter the property increments in a few different ways.

• Time windows: Used primarily in IP applications. Displays both intervals and cumulative time.

• Increment: Defines the step size (increments) for the selected base property.

For vertical properties: 

• The vertical axis of the Depths attribute increases downward.

• The vertical axis of the Elevations attribute increases upward.

Although you are not prevented from defining the Depths attribute with a negative increment, you are discouraged from doing so because this combination is equivalent to defining the Elevations attribute with a positive increment.

This button appears only if another array channel of equal dimension has a base property.

• If only one such channel exists, its name appears on the button.

• If multiple channels qualify, clicking the button opens a selection list with on-board properties to choose from.