That is interesting. Without knowing the details of the simulation (partition size, tree height and design, table dimensions/orientation, location,etc), I would say that it is likely that as the modules move in closer to one another, they experience a higher near shading beam loss, but no additional electrical string activation. Since the beam loss increases but there is no additional string activation, the string loss comes down since that additional area of the array is now a light loss rather than an electrical one.
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