Sigma X3F CFA images

Hello, it's me again.
this time about the Sigma RAW files.

After libraw_unpack(), it appears that rawdata.raw_image is null and rawdata.color3_image not null.
Does it mean that there are no Bayer patterns in this kind of file ?

My best regards,

Forums: 

Yes.

Yes.

There are 3 pointers in rawdata (raw_data, color3_data, color4_data and only one is not NULL after unpack)

-- Alex Tutubalin

Thank you.

Thank you.

Just for knowledge.
How does it work without Bayer filter to get color ?

EDIT: nevermind, I think I found on wikipedia.

Thanks again for your kindness