In scientific publications, one often finds data plots. They are usually shown individually or in groups (two or three side by side, or in multi-row panels).
Imagine one has full flexibility to design the plots for a specific publication to any horizontal/vertical size.
What are good principles to decide on the following issues?
How to decide the horizontal and vertical size of plots to be shown on their own, or in two- or three-element panels, with respect to the size of the page and/or type area?
In cases with more than one plot on the same row, how much space goes to the plots, and how much to empty space between them?
Data plots aren't left-right symmetric. Instead, one usually has numbers and labels on the left side of the plot, but not on the right. Thinking of the horizontal alignment of the plot on the page, what should be aligned with the center of the page: the center or the plot frame (not including numbers and axis name), or the center of the whole image (including numbers and axis frame)? (or something else?)
Overall, you can summarize this in the following question: what are good design principles about sizing and alignment of plots, or groups of plots, within a text?