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Drop volume manipulation with attoliter precision. (A) DPnB droplet radii measured in the course of a linear voltage ramping. Optical micrographs of the drop are taken at the stages indicated with dashed green circles. (B) Nondimensional values of rD (black filled squares) and 
(red open squares) as a function of the nondimensional ejection voltage. As suggested by Eq. 2, rD is found to be directly proportional to 
.
