I'm writing a paper in which we are comparing the response profile of various types of biosensors, and I'd like to do a collage image that shows the response curves for the various systems in subfigures A, B, C, D.
The problem is, I have found perfect examples of published curves for each system, but don't have the equipment to reproduce any of them. Therefore, I'd like to ask for permission to reprint them. What is the protocol for this? I know that they become property of the journal in which they were originally published, and so who would I need to contact (eg authors or journal)? Are certain journals more amenable to sharing than others?