%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Abstract %%%%%%%%%%%%%%%%%%%%%%%%%%%% With this template, and associated style and \LaTeX\ packages, it is possible to estimate the page length of manuscripts for submission to the SPIE journals \emph{Optical Engineering} and \emph{Optical Engineering Letters}. With a strict three-page limit, this is particularly important for the latter. This template gives simple instructions on how to prepare the manuscript. %%%%%%%%%%%%%%%%%%%%%%%%%%%% %% Usage %%%%%%%%%%%%%%%%%%%%%%%%%%%% For layout according to the Optical Engineering Journal: \documentclass[10pt,letterpaper,optengjnl]{article} For layout and page length estimate (note three-page maximum) of OE Letters: \documentclass[10pt,letterpaper,optenglett]{article} For document inaccordance with submission guidelines (12pt font, double-spacing, figures to back): \documentclass[12pt,letterpaper,optengsubmit]{article} And always: \usepackage{opteng}