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Fig. 3

image

Preparation of the samples. Panel A: metal cylinder (left) and sample holder (right) that were used to prepare the samples. The green cable with the connector belongs to one of the thermocouple sensors, which was used to monitor the sample temperature during the experiment. Panel B: the metal cylinder was plugged onto the sample holder and filled with a suspension of liquid nitrogen, water ice, and dust particles. To ensure that the setup was constantly cooled while the liquid nitrogen evaporated from the sample mixture, the outer volume of the sample holder was also filled with liquid nitrogen.

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