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The event processing and data packetization post processing offer many parameters or choices which must be made before data can be sent to the ground. The large number makes testing and definition of each possible combination of choices impractical.
Instead we define the various processing choices which can be made under the section `On-board Data Processing Choices' (Section 3.1.3), and a set of standard choices which we expect to be commonly employed under `List of Routine Modes' (Section 3.1.4).
Conceptually the easiest way to understand the selection of mode switches is to consider the choices required in order to specify ACIS operation. There are four primary decisions: