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The fundamental strategy for calibration of the ACIS instrument is to
make measurements which constrain free parameters of mathematical models
of the system. This approach was followed in calibration of the CCD detectors
themselves, and the reader must therefore understand the detector models
in order to understand the detector calibration.
In this section we describe some principles of X-ray CCD detector operation
and describe the parameters of the (simplified) CCD model which we have
fit to the data. In section 4.2, we present an overview of
the measurements made to constrain those parameters.