Plated and unplated drill layers are displayed separately. For layers counts of 2 and higher, the splitting depends upon the automatic plating detection. For layer counts 0 and 1 all drill holes are considered automatically as unplated.
In case of mixed drill layers (both plated and unplated drill holes in the same input file), the layer is split up in 2 separate entries in the layer list with an _plated or _unplated suffix.
