As a further note, when a node is placed, by default the overall height of the node will be adjusted so that it is 1 unit (e.g. 1 metre) high, and - if required - an extrusion will be done to ensure that this minimum value is reached. The config variable lets you adjust the minimum value. It may be sensible to set the variable to 0 (zero) to ensure that no extrusion is done. This would mean that the minimum height of the node will be the combined height of the two cells.
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