Electronic supplementary materials for scientific journals Journals require certain heights &amp; widths for figures, however, since it's my first time preparing an article with Latex I'm facing some problems.

For example I have a total of 20 maps &amp; I'm thinking of making a grid called (fig7) using Latex for each 8 pair of maps. When I supply 
high resolution figures with the final script do I need to combine each map that I use to make (fig7) in one figure called (fig7.eps) or do I just supply each map with its respective subscript (ex: fig7a.eps, fig7b.eps, etc)?
I cannot tell for Springer or Elsevier, but a couple of years ago I published a paper in an IOP journal which contained a table with several diagrams.

I submitted the diagrams separately and included them in the table's cells with \includegraphics, as I did it preparing the manuscript. It worked.

Each journal has its own idiosyncrasies when it comes to LaTeX practices. When the guidelines do not provide enough information, my strategy is to first try submitting the files as they are, following my workflow, and if it doesn't work I resort to other solutions.