How is infinifactory's footprint calculated?

How is infinifactory's footprint calculated? - Person Standing on Body of Water Near Island

One of the histograms available to compare to others' after a level in Infinifactory is footprint. How is this calculated? Are the unmovable starting machines included? Would removing conveyor belts and just scooting my finished parts along the ground reduce my footprint?

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How is infinifactory's footprint calculated? - Brown Sand With Heart Shaped

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