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. 2019 Mar 28;10(4):221. doi: 10.3390/mi10040221

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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A stroboscopic sequence of shadowgraph images showing the droplet ejection dynamics at pulse energy $E_{p}$ = 2.5 µJ, process parameters: λ = 515 nm, film thicknesses $d_{D}$ = 9.52 µm liquid donor, and $d_{PI}$ = 3.5 µm polyimide.