Table 2: List of AMBER spectrograph modules with acronym definition and functions.

Optical elements	Functions
SPG-INW	Input slit.
Input Wheel	Image cold stop.
SPG-CSY	Spectrograph optics cooling.
Cooling System	Vacuum, temperature, and nitrogen
	level control.
	Thermal flux reduction.
SPG-ISD	Cold stop for the spatial
Imaging and Stopping	filter mode (thermal flux reduction).
Device	Technical operations (wide diaphragm).
	Calibration (dark).
	Beam collimation.
SPG-PMW	Thermal flux reduction.
Pupils Masks Wheel	Beam size definition.
SPG-IPS	Thermal flux reduction.
Interferometric Photometric	Beam splitting.
Splitter	Beams deviation.
	Photometric images deflection on DET.
SPG-DIU	Spectral dispersion.
Dispersion Unit	Spectral wavelength selection.
	Spectral resolution selection.
	Spectral modulation.
SPG-CHA	Beam combination.
Camera	Beam focalization.
	Sampling.