is barely affected at all. This is of practical importance, because it highlights that the number of neighboring nucleation events that can be observed may be limited to a few layers beyond the point of measurement. The detection of all nucleation events in a pallet would therefore still require a large number of thermocouples. These findings confirm that thermal interaction is the responsible mechanism for the formation of the second type of spikes. A detailed analysis on how the nucleation and solidification behavior is affected by different levels of thermal interaction is provided in the supplementary information in section 5.4.