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Notes to the observer

The reduction of spectra collected using the modern CCD and IPCS detectors often require complex procedures in order to ensure that the best possible results are obtained. In many cases, the dataset which the observer brings back from the Observatory is incomplete in the sense that some of the data required for an ideal reuction is missing. It is therefore vital for the observer to ensure that equal effort is paid to obtaining a comprehensive set of calibration frames, to that which was expended on the 'Object' frames. Different types of object will produce different requirements in terms of calibration and the following are merely guidelines.

• Orientation of spectra
• CCD bias frames
• CCD overscan
• Dark count
• Flat fielding
• CCD gain
• Arc frames