Why bother to separate primary winding to 2 section?

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I'm reading the doc_der-702. For the primary side of transformer, the primary winding is divided into 2 section(detail please refer to Attachment). What is the purpose of it? For reducing the temperature, reducing common mode noise, or other reason?

Hi,

Dividing the primary winding into two sections decreases the leakage inductance.

Regards,