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Data Format


Gemini Data Format


All Flamingos-2 images are stored as MEFs. The extensions are:

[0] includes all the generic header information. At this time there is a discrepancy in the number of reads reported by the NREADS and LNRS. In all cases NREADS reports the actual number of pair (initial and final) non-destructive reads. The following table shows the reported values depending on the readmode employed:


  • LNRS=NREADS=1 for Bright object mode
  • LNRS=2, NREADS=4 for Medium Object mode
  • LNRS=6, NREADS=8 for Faint Object mode


[1] This extension contain the data. But be aware that the number of the ADUs would depend on the number or reads. In all cases the data consists of the difference between the counts at the beginning and the end of the observation.


  • CDS (one read) = First Read -Last read
  • MDS (multiple reads) = Sum of the first reads  -  Sum of the last reads. In this case a MDS ~ Nreads * CDS