Splitting publication fees among coauthors What are accepted ways of splitting publication fees among coauthors, when authors are from different research groups and potentially even different institutions? Especially with open access publication, the fees tend to come out at a substantial amount.

In general, the corresponding author seems to be responsible to the journal for the payment of the fee. I wonder what would be commonly acceptable agreements with coauthors to split such fees?

There is already a general question on splitting collaboration costs here, but the current answer does not apply to publication fees, and I am really interested in this specific case.
I think your question is a little backwards: All ways of splitting the publication fees are acceptable. You might run into some problems with your grant officer about transferring money around, but in the end they will get over it.

The more important question in my opinion is: What behaviour is acceptable from you and your co-authors. I believe the answer is to be nice since these are your co-authors after all. I wouldn't be too put off if a co-author refused to contribute to open access fees or if I was asked to contribute 1/N of the fees for an N author paper where I was a tertiary author and currently under-funded.