I recently finished my PhD and later a paper of mine (resulted from PhD work) got accepted. There are some charges for publishing, and my supervisor now wants me and other research collaborators to contribute to the payment equally.
Is this normal?
As far as I know, PhD students are not expected to pay for publication, neither are research collaborators. Any experiences with similar situations?
Edit: Regarding collaboration, my research was not part of a collaborative project. In fact, I had a scholarship from the university and was doing my research with minimal supervision. At some stage, my supervisor wasn't able to help me, and then I had to establish collaboration with other institutions. My research collaborators contributed to my research more than my supervisor did and I find it odd to ask them to pay.