\documentclass[a5paper,12pt]{memoir} \usepackage{color} \usepackage{pstool} \input macros.tex \EndPreamble \begin{document} External macros: \a, \b, \c \psfragfig*[mode=nonstop]{trial}{% \color{red} \tiny \psfrag{[Mp]}{$M_\a$!}% } \psfragfig[angle=45]{subdir/trial2}{% \psfrag{[Mp]}{$Z_\b$}% } \end{document}