The list of defective pixels

Because of the need to take a high value of the rejection coefficient in the case of defective pixel candidates, sometimes some of them are missed. The third method uses a list of recurrent defective pixels. They were detected in the stars with broad lines where they are easily distinguished. This list is taken as a map of the defective pixels of the CCD. Therefore, all the pixels of this list are assigned the flag value -100.0.

This list is unfortunatly somewhat time dependent and is updated at each observing period. We recall that what is called pixel in the extracted 1D spectrum is indeed a spectral element involving several true CCD pixels and is dependent on the position of the spectrum on the CCD.