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I just stated with Klayout. I am looking for a simple real layout file.
You mean real product layouts?
The SkyWater130 MPW one (https://foss-eda-tools.googlesource.com/third_party/shuttle/mpw-one/) is a huge source of open sourced, real layouts. But these are not simple ones.
I want to get a rougth overview of KLayout.
Therefore I want to have a simpl Layout.
On the link it seems to be not easy to get a .gds file
Anything? Help yourself here: https://github.com/KLayout/klayout/tree/master/testdata/gds
But next time please be more specific.
I was looking for a test file recently as well, and went with this one from the SkyWater MPW-2 shuttle:
GDS file is at gds/user_project_wrapper.gds.gz