Table 1. Comparison of the sample volumes used for both capillaries.

All values were calculated for a total volume V _tot = 20 µl. d _i: inner capillary diameter; V _sample: volume needed to fill the capillary for full exposure; V _beam: focal volume of the beam, i.e. the volume exposed for fixed sample; V _exp: volume exposed for flowing sample; ΔV _{loss, fix}: loaded volume not exposed to the beam for fixed sample; ΔV _{loss, flow}: loaded volume not exposed to the beam for flowing sample; V _beam/V _sample: consumption efficiency.

d i (mm)	V sample (nl)	V beam (nl)	V exp (µl)	ΔV loss,fix (nl)	ΔV loss,flow (µl)	V beam/V sample (%)
1.7	794	178	4.47	617	15.53	22
0.9	223	93	8.33	130	11.67	42