--- preamble.orig	2026-10-15 00:12:45.583943011 +0000
+++ preamble.tex	2026-10-15 00:12:45.623536719 +0000
@@ -201,7 +201,12 @@
 % replaced by titlesec in section 9, so wpi.sty must stay loaded BEFORE it.
 
 % \usepackage{arxiv}    % arxiv.sty
-\usepackage{wpi}        % wpi.sty
+% Fist and Rose journal mode: \newcommand{\FRjournal}{} before \input{preamble}
+\ifdefined\FRjournal
+  \usepackage{fistandrose}   % fistandrose.sty (loads wpi.sty itself)
+\else
+  \usepackage{wpi}           % wpi.sty
+\fi
 
 % \begin{appendices} ... \end{appendices}  and  \appendix
 % Note: \renewcommand{\thesection}{\Alph{section}.} would add a period after