Dear respondents,
Thank you all for replying to my query and to the moderators for editing my post. I apologise for the form of the initial posting, which was appropriate to the text only Mathgroup forum to which I last posted some time ago. As a result of suggestions by David Park I have worked out a solution to my problem using Epilog and Prolog. I don't thinikk it is a great solution, due to my lack of expertise in all the options of the commands.
I am attaching a notebook that shows more clearly (with all of the commands and output) the problem I was referring to and a rough solution to it. I am still unsure of the best solution for preparing figures for publication, which often have to be resized or modified during the publication process. Most journals don't have access to Mathematica, so I assume figures have to be converted to .pdf or other formats. If there is a guide to figure preparation out there somewhere, that takes account of the fact that not everyone has Ma, I would be pleased to hear about it.
LP
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