The IFS detector read out noise is specified to be lower than 15e-. Given
the gain (see user manual) of 1.8 e-/ADU, this results in 8.33 ADU (IFS).
Please note the temperature dependence documented in the FULL plots.
Evaluation:
For IFS, DIT=2 the ron is below the specification, but for DIT=30 the detector is underperformant. More precisely: The detetctor read noise and the dark level induced photon noise at DIT=30 cannot be disentangled, resulting in a measurement of the statistical noise of 11 ADU, while the detector ron contribution alone might be still below the specification. As the KPI plot reference value we choose the long-term average 5.12 ADU (DIT=2) and 11.6 ADU (DIT=30)