INGRID readout modes

• CDS (correlated double sampling) is the standard readout mode.
• MNDR (multiple non descructive read) can be used to reduce the readout noise, which decreases with the square root of the number of reads. This is especially useful for observations with very low backgrounds where the readout noise becomes dominating. The MNDR mode can be set with
  SYS> rmode ingrid mndr <Nr> <Nav>
  where <Nr> is the number of multiple reads and must be between 1 and 16. For Nr = 1 the MNDR is identical with CDS. <Nav> is the number of averaged exposures.
• The readout speed can be set to slow or fast:
  SYS> rspeed ingrid <speed>
• It is possible to read only certain windows from the detector. However, we do not recommend to use this mode due to hardware limitations (see the link), and since it usually leads to confusion during data reduction.

INGRID data formats

• diff: The FITS file has only one extension that contains the difference between the actual exposure and the pre-read.
• diff_pre: The first FITS extension contains the difference between the exposure and its pre-read, the second extension contains the pre-read alone.

       SYS> storemode ingrid <format>