Table 2. Comparison of technical features between the PD and the AeGe (see also text).

Feature	PD	AeGe
Drop diameter (H2O)	20–30 µm	7–15 µm
Drop diameter (DMSO)	30–40 µm	20–30 µm
No. of drops per impulse	Single	Multiple
Drop distribution on crystal	Local	Statistical
Crystal targeting	Direct	Indirect
Minimum operation volume	30 µl	10 µl
Stability and reproducibility	Medium	High
Solution compatibility	Medium	High
Device cooling	No	Yes