Flat file in siril shows some grid lines

I am seeing this with the flats in siril and I was wondering if it is a problem or not:


It is shown in ‘Linear’ mode.

The same file in ART is shown as I would expect:

The file itself is:
_1069525.RW2 (34.0 MB)

Is this a problem or just something expected?

The camera is a Lumix S5, in case this maters …

Hello.

I think you’re new to astrophotography?

I strongly recommend that you read our documentation and tutorials.

To answer your question. Yes, this pattern, the CFA pattern, is normal.

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Thanks for the reply and for the recommendation!