canyon wrote

I'm talking about the alignment of cell contents, not the table as a whole on the page.
Sorry, looking at my reply to your first comment on this it is indeed misleading.

Creating a docbook.xml via asciidoctor and from there using fop with fopub's stylesheets leaves me with all the table's content left aligned.

Interesting though, that running fopub gives you centered content. That would mean that fopub does more changes than just providing some additional stylesheets I reckon?