dc	[μm]	Diameter of the main channel of the PC chips
dOD1	[μm]	Diameter of the first optical detector
dOD2	[μm]	Diameter of the second optical detector
n	[‐]	Droplet index
nmax	[‐]	Number of all generated droplets in a run
Qc	[μL/min]	Volumetric flow rate of the continuous phase (organic phase, separation medium, perfluorodecaline)
Qd	[μL/min]	Volumetric flow rate of the disperse phase (aqueous or sample phase, biological media)
Sa	[μm]	Arithmetical mean height of the surface (area roughness)
sD,nOD	[μm]	Droplet length calculated from the optical detector singals
sD,OD	[μm]	Average droplet length calculated from the optical detector signals
sD,SP	[μm]	Average droplet length calculated from the syringe pump level
sTD,nOD	[μm]	Transformed droplet length calculated from the optical detector signals
Ts/s	[‐]	Transformation factor