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The middle part is a stiffner that makes the part stronger. It's just a "bump" that's punched into the sheetmetal.
To add this bump to your model; first add an oval shaped Pad 9mm high on the inside. Then add the fillets. Next Pocket the lower portion 5mm deep (9 - 4 thick = 5), and add the fillets.
(this type of feature can be added automatically with the Sheetmetal workbench)
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