Table 1.

Characterization of noise within the dark images due to stray radiation.

	U2000	Luca	Luca, EM mode
Noisy pixel probability (%)	0.19	0.27	0.39
Noise cluster probability (%)	0.16	0.08	0.09
Mean noise cluster size (pixels)	1.2	3.2	4.4
Median noise cluster size (pixels)	1	2	4
Standard deviation (pixels)	0.6	2.7	3.5
Maximum noise cluster size (pixels)	20	47	52