Plot ?	Symb ?	Source *	Average ?			Thresholds ?		N_ data	QC1 parameter	Data downloads	Remarks
			method	value	unit	method	value
1	•	QC1DB	MEDIAN	243	ADU	VAL	235,250	87	median_master	this | last_yr | all	median BIAS level
2	•	QC1DB	MEDIAN	4.02	e-	VAL	3.5,4.3	87	sigma_raw	this | last_yr | all	RON in single raw frame downloaded data come in ADU (=e-/2.30)
3	•	QC1DB	MEDIAN	2.18	e-	VAL	1.95,2.40	87	sigma_master	this | last_yr | all	RON in master frame downloaded data come in ADU (=e-/2.30)
4	x	QC1DB	MEDIAN	0.073	ADU	VAL	0.05,0.12	87	struct_row	this | last_yr | all	structure of master in X direction
5	x	QC1DB	MEDIAN	0.371	ADU	VAL	0.1,0.5	87	struct_col	this | last_yr | all	structure of master in Y direction
6	•	QC1DB	MEDIAN	140	N	VAL	0,1000	87	bpm_npix	this | last_yr | all	number of bad pixels
*Data sources: QC1DB: QC1 database; LOCAL: local data source

This is the trending plot for the GIRAFFE QC parameters derived from BIAS frames.

These plots describe:
1. the BIAS level in masterbias frames,
2. the read noise (RON) of a single raw frame,
3. the read noise (RON) of a master frame,
4. the collapsed structure of a masterbias in X direction,
5. the collapsed structure in Y direction,
6. the number of bad pixels.

Find more information about GIRAFFE BIAS frames here.

Other QC parameters related to detector properties (like contamination, linearity, gain) are trended here.