The following properties of GIRAFFE detector and instrument components are trended:

• BIAS level and read noise
• dark current
• noise properties, gain, contamination

gratings

• stability of spectral format

calibration lamps

• FF lamp stability
• simultaneous calibration lamp stability
• arclamp stability
• nasmyth flat lamp

fibre system

• fibre availability and efficiency

full system (telescope plus instrument plus detector)

• efficiency

pipeline products
There is also trending of the quality of some key pipeline products:

• flat field exposure level
• flat field saturation
• wavelength calibration