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The Layer of AD8099's footprint

Category: Hardware
Product Number: AD8099

https://vendor.ultralibrarian.com/adi/embedded?vdrPN=AD8099ARDZ

I downloaded the footprint of AD8099ARDZ in DXF format from the above website.

Please see image below, I found that the data is divided into layers.

Could you please tell me what each layer (L1/2/3/6/7/8/18/23) represents?

For example, L1: component outline, L3: foot pattern, L6: metal mask, etc.