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The Service Module (or SVM) which carries the housekeeping subsystems - power, propulsion, attitude control, command and control, telemetry, and thermal control. The design of the MetOp platform allows these two components to be developed, analysed and tested separately - a feature that was especially important for Envisat, and also for MetOp as these spacecraft are too large to fit comfortably inside a conventional solar simulation chamber as a single assembly.