Plot 1 scores: 1|
data source:	sphere_ifs_dark (QC1 database)
dataset:	qc_ron	•
median:	5.10851	ADU
fixed thresholds:	1...7	ADU
N_data plotted:	21
[click plot for closeup]

Plot 2 scores: 1|
data source:	sphere_ifs_dark (QC1 database)
dataset:	qc_ron	•
median:	6.78052	ADU
fixed thresholds:	4...9	ADU
N_data plotted:	21
[click plot for closeup]

Plot 3 scores: 1|
data source:	sphere_ifs_dark (QC1 database)
dataset:	qc_ron	•
median:	11.4079	ADU
fixed thresholds:	5...17	ADU
N_data plotted:	21
[click plot for closeup]

The QC parameter qc_ron is not calculated by the pipeline but by a QC script. From the raw frame fits cube, five planes are extracted (plane 6 to 10), and for each pixel the stdev (out of five independent reads) is calculated. The median over all pixels stdev is taken.

The parameter qc_ron contains statistical noise, which is composed of a static detector readout noise component of 2.47 ADU and a exposure time dependent component of

sqrt(counts / gain)

corresponding to the shot noise induced by the background radiation. In box (4) the function 2.47 + sqrt(-6 + 10.2 * DIT / 3.6) is overplotted.

The three reference setups (DIT=2, 8, and 30) are scored according to the dashed lines in boxes 1,2, and 3. All other setups are scored according to the non-linear arithmetic relation indicated by the dashed curves in box 4.

• upper threshold = sqrt((-6 + 10.2 * DIT)/3.6)+2.47 -2.0-0.1*DIT
• lower threshold = sqrt((-6 + 10.2 * DIT)/3.6)+2.47 +3.0+0.1*DIT