diff --git a/home-manager/modules/tex.nix b/home-manager/modules/tex.nix
new file mode 100644
index 0000000..0055b0b
--- /dev/null
+++ b/home-manager/modules/tex.nix
@@ -0,0 +1,287 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: let
+  enabled = config.custom.enableOrgTex;
+in {
+  options.custom.enableOrgTex = lib.mkEnableOption "Enable Emacs Org and LaTeX configuration";
+  config = lib.mkIf enabled (let
+    aspellPackage = pkgs.aspellWithDicts (d: [d.en d.en-science d.en-computers d.fr]);
+    texliveset = pkgs.texlive.combine {
+      inherit
+        (pkgs.texlive)
+        scheme-basic
+        babel
+        amscls
+        amsmath
+        biber
+        biblatex
+        biblatex-mla
+        block
+        cancel
+        caption
+        capt-of
+        csquotes
+        enotez
+        enumitem
+        etex
+        etoolbox
+        fancyhdr
+        float
+        fontaxes
+        graphics
+        hanging
+        hyperref
+        latex
+        latexindent
+        latexmk
+        logreq
+        metafont
+        mlacls
+        newtx
+        pdflscape
+        pdfpages
+        preprint
+        psnfss
+        ragged2e
+        titlesec
+        tools
+        translations
+        ulem
+        url
+        wrapfig
+        xstring
+        xkeyval
+        ;
+    };
+  in {
+    home.packages = with pkgs; [
+      texliveset
+      aspellPackage
+      gnuplot
+      plantuml
+    ];
+
+    programs.emacs.extraPackages = let
+      org-auctex = pkgs.emacsPackages.trivialBuild rec {
+        pname = "org-auctex";
+        version = "e1271557b9f36ca94cabcbac816748e7d0dc989c";
+
+        buildInputs = [pkgs.emacsPackages.auctex];
+
+        src = pkgs.fetchFromGitHub {
+          owner = "karthink";
+          repo = pname;
+          rev = version;
+          sha256 = "sha256-cMAhwybnq5HA1wOaUqDPML3nnh5m1iwEETTPWqPbAvw=";
+        };
+      };
+    in (with pkgs.emacsPackages; [
+      org-auctex
+      auctex
+      cdlatex
+      citeproc
+      graphviz-dot-mode
+      ivy-bibtex
+      gnuplot
+      htmlize
+      org-auctex
+      org-contrib
+      org-download
+      pdf-tools
+      plantuml-mode
+    ]);
+
+    home.file.".emacs.d/org-init.el".text =
+      /*
+      elisp
+      */
+      ''
+        (require 'cdlatex)
+        (require 'citeproc)
+        (require 'gnuplot)
+        (require 'gnuplot-context)
+        (require 'graphviz-dot-mode)
+        (require 'htmlize)
+        (require 'ivy-bibtex)
+        (require 'ob-dot)
+        (require 'ob-emacs-lisp)
+        (require 'ob-gnuplot)
+        (require 'ob-matlab)
+        (require 'ob-python)
+        (require 'ob-shell)
+        (require 'oc)
+        (require 'oc-basic)
+        (require 'oc-csl)
+        (require 'oc-natbib)
+        (require 'org-auctex)
+        (require 'org-contrib)
+        (require 'org-download)
+        (require 'ox-latex)
+        (require 'ox-publish)
+        (require 'pdf-tools)
+        (require 'plantuml-mode)
+        (require 'tex)
+
+        (autoload 'gnuplot-mode "gnuplot" "Gnuplot major mode" t)
+        (autoload 'gnuplot-make-buffer "gnuplot" "open a buffer in gnuplot-mode" t)
+        (setq auto-mode-alist (append '(("\\.gp$" . gnuplot-mode)) auto-mode-alist))
+
+        (define-key graphviz-dot-mode-map (kbd "C-c C-y") 'graphviz-dot-indent-graph)
+
+        (defvar zotero-bibliography (expand-file-name "zotero.bib" org-directory))
+
+        (defvar ivy-bibtex-bibliography (list zotero-bibliography))
+        (setq reftex-default-bibliography (list zotero-bibliography))
+        (setq bibtex-completion-pdf-field "file")
+
+        (add-hook 'LaTeX-mode-hook 'turn-on-cdlatex)
+        (add-hook 'LaTeX-mode (lambda ()
+                                (turn-on-reftex)))
+        (setq TeX-PDF-mode t
+              TeX-auto-save t
+              TeX-parse-self t)
+
+        (setq org-babel-octave-shell-command "octave -q")
+
+        (setq org-babel-python-command "python3.10")
+        (setq-default python-indent-guess-indent-offset-verbose nil)
+        (defun my/org-babel-execute:python-session (body params)
+          "Initiate a python session before executing org babel blocks that use sessions.
+        BODY is the content of the org-babel block and PARAMS are any parameters specified."
+          (let ((session-name (cdr (assq :session params))))
+            (when (not (eq session-name "none"))
+              (org-babel-python-initiate-session session-name))))
+        (advice-add #'org-babel-execute:python :before #'my/org-babel-execute:python-session)
+
+        (defun my/indent-org-block-automatically ()
+          "Indent the current org code block."
+          (interactive)
+          (when (org-in-src-block-p)
+            (org-edit-special)
+            (indent-region (point-min) (point-max))
+            (org-edit-src-exit)))
+        (defun my/org-force-open-current-window ()
+          "Open a link using 'org-open-at-point' in current window."
+          (interactive)
+          (let ((org-link-frame-setup
+                 (quote
+                  ((vm . vm-visit-folder)
+                   (vm-imap . vm-visit-imap-folder)
+                   (gnus . gnus)
+                   (file . find-file)
+                   (wl . wl)))
+                 ))
+            (org-open-at-point)))
+        (defun my/follow-org-link (arg)
+          "Follow a link in orgmode If ARG is given.
+        Opens in new window otherwise opens in current window."
+          (interactive "P")
+          (if arg
+              (org-open-at-point)
+            (my/org-force-open-current-window)))
+        (defun krofna-hack ()
+          "Toggle latex fragments after exiting closing them."
+          (when (looking-back (rx "$ "))
+            (save-excursion
+              (backward-char 1)
+              (org-latex-preview))))
+
+
+        (global-set-key (kbd "C-c n a") 'org-agenda)
+
+        (setq org-agenda-start-on-weekday nil)
+
+        (define-key org-mode-map (kbd "C-c C-o") 'my/follow-org-link)
+        (define-key org-mode-map (kbd "C-c C-y") 'my/indent-org-block-automatically)
+        (define-key org-mode-map (kbd "C-c ]") 'org-cite-insert)
+
+        (add-hook 'org-babel-after-execute-hook 'org-redisplay-inline-images)
+        (add-hook 'org-mode-hook 'visual-line-mode)
+        (add-hook 'org-mode-hook 'org-cdlatex-mode)
+        (add-hook 'org-mode-hook
+                  (lambda ()
+                    (add-hook 'post-self-insert-hook #'krofna-hack 'append 'local)))
+
+        (add-to-list 'org-latex-classes
+                     '("mla"
+                       "\\documentclass{mla}"
+                       ("\\section{%s}" . "\\section*{%s}")
+                       ("\\subsection{%s}" . "\\subsection*{%s}")
+                       ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
+                       ("\\paragraph{%s}" . "\\paragraph*{%s}")
+                       ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
+        (add-to-list 'org-latex-classes
+                     '("letter"
+                       "\\documentclass{letter}"
+                       ("\\section{%s}" . "\\section*{%s}")
+                       ("\\subsection{%s}" . "\\subsection*{%s}")
+                       ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))
+
+        (plist-put org-format-latex-options :scale 3)
+
+        (setq org-agenda-files (list org-directory (expand-file-name "ubc" org-directory)))
+        (setq org-agenda-tags-column 0)
+        (setq org-auto-align-tags nil)
+        (setq org-fold-catch-invisible-edits 'show-and-error)
+        (setq org-cite-export-processors '((t basic)))
+        (setq org-cite-global-bibliography (list zotero-bibliography))
+        (setq org-confirm-babel-evaluate nil)
+        (setq org-ellipsis "…")
+        (setq org-export-with-tags nil)
+        (setq org-hide-emphasis-markers t)
+        (setq org-highlight-latex-and-related '(latex))
+        (setq org-html-head-include-default-style nil)
+        (setq org-html-head-include-scripts nil)
+        (setq org-html-validation-link nil)
+        (setq org-image-actual-width 300)
+        (setq org-insert-heading-respect-content t)
+        (setq org-latex-pdf-process '("latexmk -pdflatex='pdflatex -interaction nonstopmode' -pdf -bibtex -f %f"))
+        (setq org-pretty-entities t)
+        (setq org-preview-latex-default-process 'dvisvgm)
+        (setq org-special-ctrl-a/e t)
+        (setq org-src-fontify-natively t)
+        (setq org-src-preserve-indentation t)
+        (setq org-src-tab-acts-natively t)
+        (setq org-src-window-setup 'current-window)
+        (setq org-tags-column 0)
+
+        (setq org-agenda-time-grid
+              '((daily today require-timed)
+                (800 1000 1200 1400 1600 1800 2000)
+                " ┄┄┄┄┄ " "┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄"))
+
+        (setq org-exports-dir (expand-file-name "exports" org-directory))
+
+        (setq org-publish-project-alist
+              (list (cons "html"
+                          (list :base-directory org-directory
+                                :base-extension "org"
+                                :htmlized-source t
+                                :recursive t
+                                :publishing-directory org-exports-dir
+                                :publishing-function 'org-html-publish-to-html))
+                    (cons "pdf"
+                          (list :base-directory org-directory
+                                :base-extension "org"
+                                :recursive t
+                                :publishing-directory org-exports-dir
+                                :publishing-function 'org-latex-publish-to-pdf))
+                    (cons "all" '(:components ("html" "pdf")))))
+
+        (add-hook 'org-mode-hook 'org-auctex-mode)
+
+        (add-hook 'dired-mode-hook 'org-download-enable)
+        (setq-default org-download-image-dir (expand-file-name "images" org-directory))
+
+        (add-hook 'org-mode-hook 'org-modern-mode)
+
+        (setq-default pdf-view-display-size 'fit-width)
+        (defvar pdf-annot-activate-created-annotations t)
+
+        (setq plantuml-default-exec-mode 'executable)
+      '';
+  });
+}
diff --git a/home-manager/profiles/willem/base.nix b/home-manager/profiles/willem/base.nix
index 788ede4..400248a 100644
--- a/home-manager/profiles/willem/base.nix
+++ b/home-manager/profiles/willem/base.nix
@@ -23,4 +23,16 @@ in rec {
       MAILDIR = "${config.home.homeDirectory}/Maildir";
     };
   };
+
+  custom.enableOrgTex = lib.mkDefault true;
+
+  home.file = {
+    ".config/nixpkgs/config.nix".text = ''
+      # -*-nix-*-
+      {
+        nixpkgs.config.allowUnfreePredicate = (_: true);
+        allowUnfree = true;
+      }
+    '';
+  };
 }
diff --git a/home-manager/profiles/willem/packages.nix b/home-manager/profiles/willem/packages.nix
index c4df51a..cf31319 100644
--- a/home-manager/profiles/willem/packages.nix
+++ b/home-manager/profiles/willem/packages.nix
@@ -17,53 +17,6 @@
     yarn
   ];
   octave-wp = pkgs.octave.withPackages (p: with p; [symbolic]);
-  texliveset = pkgs.texlive.combine {
-    inherit
-      (pkgs.texlive)
-      scheme-basic
-      babel
-      amscls
-      amsmath
-      biber
-      biblatex
-      biblatex-mla
-      block
-      cancel
-      caption
-      capt-of
-      csquotes
-      enotez
-      enumitem
-      etex
-      etoolbox
-      fancyhdr
-      float
-      fontaxes
-      graphics
-      hanging
-      hyperref
-      latex
-      latexindent
-      latexmk
-      logreq
-      metafont
-      mlacls
-      newtx
-      pdflscape
-      pdfpages
-      preprint
-      psnfss
-      ragged2e
-      titlesec
-      tools
-      translations
-      ulem
-      url
-      wrapfig
-      xstring
-      xkeyval
-      ;
-  };
   fenix-rust = pkgs.fenix.combine (with pkgs.fenix; [
     latest.toolchain
     targets.thumbv7em-none-eabihf.latest.rust-std
diff --git a/home-manager/profiles/willem/programs/emacs/default.nix b/home-manager/profiles/willem/programs/emacs/default.nix
index ded84b1..3b02580 100644
--- a/home-manager/profiles/willem/programs/emacs/default.nix
+++ b/home-manager/profiles/willem/programs/emacs/default.nix
@@ -3,7 +3,6 @@
   pkgs,
   ...
 }: let
-  aspellPackage = pkgs.aspellWithDicts (d: [d.en d.en-science d.en-computers d.fr]);
   emacsPackage =
     (pkgs.emacsPackagesFor pkgs.emacs29).emacsWithPackages
     (epkgs:
@@ -19,19 +18,6 @@
             sha256 = "sha256-6aX2S4cUop1rdxweIF5f1qrgNmYd1mtWgT9T1Q1s2h8=";
           };
         };
-        org-auctex = epkgs.trivialBuild rec {
-          pname = "org-auctex";
-          version = "e1271557b9f36ca94cabcbac816748e7d0dc989c";
-
-          buildInputs = [epkgs.auctex];
-
-          src = pkgs.fetchFromGitHub {
-            owner = "karthink";
-            repo = pname;
-            rev = version;
-            sha256 = "sha256-cMAhwybnq5HA1wOaUqDPML3nnh5m1iwEETTPWqPbAvw=";
-          };
-        };
         lean4-mode = epkgs.trivialBuild rec {
           pname = "lean4-mode";
           version = "d1c936409ade7d93e67107243cbc0aa55cda7fd5";
@@ -52,9 +38,6 @@
       in [
         all-the-icons
         all-the-icons-dired
-        auctex
-        cdlatex
-        citeproc
         company-mode
         company-sourcekit
         counsel
@@ -64,11 +47,7 @@
         f
         flycheck
         format-all
-        gnuplot
-        graphviz-dot-mode
-        htmlize
         ivy
-        ivy-bibtex
         lean4-mode
         lsp-mode
         lua-mode
@@ -78,12 +57,7 @@
         nix-mode
         nix-update
         org
-        org-auctex
-        org-contrib
-        org-download
         org-modern
-        pdf-tools
-        plantuml-mode
         polymode
         poly-org
         rustic
@@ -95,9 +69,6 @@
         yasnippet
       ])
       ++ (with pkgs; [
-        aspellPackage
-        gnuplot
-        plantuml
         sqlite
       ]));
 in {
diff --git a/home-manager/profiles/willem/programs/emacs/init.el b/home-manager/profiles/willem/programs/emacs/init.el
index 54e46e8..84c046d 100644
--- a/home-manager/profiles/willem/programs/emacs/init.el
+++ b/home-manager/profiles/willem/programs/emacs/init.el
@@ -60,51 +60,31 @@
 
 (require 'all-the-icons)
 (require 'all-the-icons-dired)
-(require 'cdlatex)
-(require 'citeproc)
 (require 'company)
 (require 'counsel)
 (require 'edit-indirect)
 (require 'editorconfig)
 (require 'eglot)
 (require 'format-all)
-(require 'gnuplot)
-(require 'gnuplot-context)
-(require 'graphviz-dot-mode)
-(require 'htmlize)
 (require 'ivy)
-(require 'ivy-bibtex)
 (require 'lean4-mode)
 (require 'magit)
 (require 'meow)
 (require 'nix-mode)
 (require 'nix-update)
-(require 'ob-dot)
-(require 'ob-emacs-lisp)
-(require 'ob-gnuplot)
-(require 'ob-matlab)
-(require 'ob-python)
-(require 'ob-shell)
-(require 'oc)
-(require 'oc-basic)
-(require 'oc-csl)
-(require 'oc-natbib)
 (require 'org)
-(require 'org-auctex)
-(require 'org-contrib)
-(require 'org-download)
 (require 'org-modern)
-(require 'ox-latex)
-(require 'ox-publish)
-(require 'pdf-tools)
-(require 'plantuml-mode)
 (require 'polymode)
 (require 'rustic)
 (require 'rust-ts-mode)
 (require 'swiper)
-(require 'tex)
 (require 'yasnippet)
 
+(let ((org-config (expand-file-name "~/.emacs.d/org-init.el")))
+ (when (file-exists-p org-config)
+   (load-file org-config))
+)
+
 (setq org-directory (expand-file-name "~/Documents/org"))
 
 (add-hook 'dired-mode-hook 'all-the-icons-dired-mode)
@@ -140,12 +120,6 @@
 (add-to-list 'format-all-default-formatters '("Nix" alejandra))
 (setq-default format-all-formatters format-all-default-formatters)
 
-(autoload 'gnuplot-mode "gnuplot" "Gnuplot major mode" t)
-(autoload 'gnuplot-make-buffer "gnuplot" "open a buffer in gnuplot-mode" t)
-(setq auto-mode-alist (append '(("\\.gp$" . gnuplot-mode)) auto-mode-alist))
-
-(define-key graphviz-dot-mode-map (kbd "C-c C-y") 'graphviz-dot-indent-graph)
-
 (global-set-key (kbd "C-c C-r") 'ivy-resume)
 (add-hook 'after-init-hook 'ivy-mode)
 
@@ -159,21 +133,6 @@
       '((ivy-bibtex . ivy--regex-ignore-order)
         (t . ivy--regex-plus)))
 
-(defvar zotero-bibliography (expand-file-name "zotero.bib" org-directory))
-
-(defvar ivy-bibtex-bibliography (list zotero-bibliography))
-(setq reftex-default-bibliography (list zotero-bibliography))
-(setq bibtex-completion-pdf-field "file")
-
-(add-hook 'LaTeX-mode-hook 'turn-on-cdlatex)
-(add-hook 'LaTeX-mode (lambda ()
-                        (turn-on-reftex)))
-(setq TeX-PDF-mode t
-      TeX-auto-save t
-      TeX-parse-self t)
-
-
-
 (defun meow-setup ()
   "Initialize meow-edit for colemak."
   (setq meow-cheatsheet-layout meow-cheatsheet-layout-colemak)
@@ -279,149 +238,9 @@
 
 (add-to-list 'auto-mode-alist '("\\.nix$" . poly-nix-mode))
 
-
 ;; Automatically update hash for nix fetch functions
 (define-key nix-mode-map (kbd "C-c C-u") 'nix-update-fetch)
 
-(setq org-babel-octave-shell-command "octave -q")
-
-(setq org-babel-python-command "python3.10")
-(setq-default python-indent-guess-indent-offset-verbose nil)
-(defun my/org-babel-execute:python-session (body params)
-  "Initiate a python session before executing org babel blocks that use sessions.
-BODY is the content of the org-babel block and PARAMS are any parameters specified."
-  (let ((session-name (cdr (assq :session params))))
-    (when (not (eq session-name "none"))
-      (org-babel-python-initiate-session session-name))))
-(advice-add #'org-babel-execute:python :before #'my/org-babel-execute:python-session)
-
-(defun my/indent-org-block-automatically ()
-  "Indent the current org code block."
-  (interactive)
-  (when (org-in-src-block-p)
-    (org-edit-special)
-    (indent-region (point-min) (point-max))
-    (org-edit-src-exit)))
-(defun my/org-force-open-current-window ()
-  "Open a link using 'org-open-at-point' in current window."
-  (interactive)
-  (let ((org-link-frame-setup
-         (quote
-          ((vm . vm-visit-folder)
-           (vm-imap . vm-visit-imap-folder)
-           (gnus . gnus)
-           (file . find-file)
-           (wl . wl)))
-         ))
-    (org-open-at-point)))
-(defun my/follow-org-link (arg)
-  "Follow a link in orgmode If ARG is given.
-Opens in new window otherwise opens in current window."
-  (interactive "P")
-  (if arg
-      (org-open-at-point)
-    (my/org-force-open-current-window)))
-(defun krofna-hack ()
-  "Toggle latex fragments after exiting closing them."
-  (when (looking-back (rx "$ "))
-    (save-excursion
-      (backward-char 1)
-      (org-latex-preview))))
-
-
-(global-set-key (kbd "C-c n a") 'org-agenda)
-
-(setq org-agenda-start-on-weekday nil)
-
-(define-key org-mode-map (kbd "C-c C-o") 'my/follow-org-link)
-(define-key org-mode-map (kbd "C-c C-y") 'my/indent-org-block-automatically)
-(define-key org-mode-map (kbd "C-c ]") 'org-cite-insert)
-
-(add-hook 'org-babel-after-execute-hook 'org-redisplay-inline-images)
-(add-hook 'org-mode-hook 'visual-line-mode)
-(add-hook 'org-mode-hook 'org-cdlatex-mode)
-(add-hook 'org-mode-hook
-          (lambda ()
-            (add-hook 'post-self-insert-hook #'krofna-hack 'append 'local)))
-
-(add-to-list 'org-latex-classes
-             '("mla"
-               "\\documentclass{mla}"
-               ("\\section{%s}" . "\\section*{%s}")
-               ("\\subsection{%s}" . "\\subsection*{%s}")
-               ("\\subsubsection{%s}" . "\\subsubsection*{%s}")
-               ("\\paragraph{%s}" . "\\paragraph*{%s}")
-               ("\\subparagraph{%s}" . "\\subparagraph*{%s}")))
-(add-to-list 'org-latex-classes
-             '("letter"
-               "\\documentclass{letter}"
-               ("\\section{%s}" . "\\section*{%s}")
-               ("\\subsection{%s}" . "\\subsection*{%s}")
-               ("\\subsubsection{%s}" . "\\subsubsection*{%s}")))
-
-(plist-put org-format-latex-options :scale 3)
-
-(setq org-agenda-files (list org-directory (expand-file-name "ubc" org-directory)))
-(setq org-agenda-tags-column 0)
-(setq org-auto-align-tags nil)
-(setq org-fold-catch-invisible-edits 'show-and-error)
-(setq org-cite-export-processors '((t basic)))
-(setq org-cite-global-bibliography (list zotero-bibliography))
-(setq org-confirm-babel-evaluate nil)
-(setq org-ellipsis "…")
-(setq org-export-with-tags nil)
-(setq org-hide-emphasis-markers t)
-(setq org-highlight-latex-and-related '(latex))
-(setq org-html-head-include-default-style nil)
-(setq org-html-head-include-scripts nil)
-(setq org-html-validation-link nil)
-(setq org-image-actual-width 300)
-(setq org-insert-heading-respect-content t)
-(setq org-latex-pdf-process '("latexmk -pdflatex='pdflatex -interaction nonstopmode' -pdf -bibtex -f %f"))
-(setq org-pretty-entities t)
-(setq org-preview-latex-default-process 'dvisvgm)
-(setq org-special-ctrl-a/e t)
-(setq org-src-fontify-natively t)
-(setq org-src-preserve-indentation t)
-(setq org-src-tab-acts-natively t)
-(setq org-src-window-setup 'current-window)
-(setq org-tags-column 0)
-
-(setq org-agenda-time-grid
-      '((daily today require-timed)
-        (800 1000 1200 1400 1600 1800 2000)
-        " ┄┄┄┄┄ " "┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄"))
-
-(setq org-exports-dir (expand-file-name "exports" org-directory))
-
-(setq org-publish-project-alist
-      (list (cons "html"
-                  (list :base-directory org-directory
-                        :base-extension "org"
-                        :htmlized-source t
-                        :recursive t
-                        :publishing-directory org-exports-dir
-                        :publishing-function 'org-html-publish-to-html))
-            (cons "pdf"
-                  (list :base-directory org-directory
-                        :base-extension "org"
-                        :recursive t
-                        :publishing-directory org-exports-dir
-                        :publishing-function 'org-latex-publish-to-pdf))
-            (cons "all" '(:components ("html" "pdf")))))
-
-(add-hook 'org-mode-hook 'org-auctex-mode)
-
-(add-hook 'dired-mode-hook 'org-download-enable)
-(setq-default org-download-image-dir (expand-file-name "images" org-directory))
-
-(add-hook 'org-mode-hook 'org-modern-mode)
-
-(setq-default pdf-view-display-size 'fit-width)
-(defvar pdf-annot-activate-created-annotations t)
-
-(setq plantuml-default-exec-mode 'executable)
-
 (define-key eglot-mode-map (kbd "C-c C-y") 'eglot-format-buffer)
 (define-key eglot-mode-map (kbd "C-c C-a") 'eglot-code-actions)
 (setq eglot-extend-to-xref t)