+ <p>
+ All of the substitutions talked about so far are evaluated in the argument parsing process. If in some cases (almost certainly involving structure images!) you find <code>{n}</code> is not incrementing when you think it should, when specifying <code>‑‑structureimage</code> filenames you can also use <code>{m}</code> and <code>{++m}</code>, along with <code>{structuredirname}</code>, <code>{structurebasename}</code> and <code>{structureextension}</code> which are substituted at the point of use. <code>{m}</code> is just a plain counter starting at 0.
+ </p>