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    CU2: Data Simulations
    Validation and verification of the DPAC system(s) requires detailed simulated data for all aspects of the Gaia mission, and at various levels of detail, including the astronomical, spacecraft and instrument contributions to:

    (a) low-volume high-fidelity instrument simulations;
    (b) high-volume telemetry stream simulations for all instruments;
    (c) higher level data relevant for validation by each CU.

    CU2 will develop and maintain the simulator throughout the project lifetime.