TSMC PDK Stream Layer "ref" (0;0) purpose?

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mult

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Hi,

does anybody know what is the purpose of "ref" layer, number 0, datatype 0 in TSMC PDK?

streamLayers(
;( layer streamNumber dataType translate )
;( ----- ------------ -------- --------- )
( ("ref" "drawing") 0 0 t )

This layer appears in GDS file, which is result of TSMC "DUMMY OD POLY INSERTION UTILITY" usage.

Thanks.
 

I guess it's the background layer (because of layer name ref & layer number 0).
 

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