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diff --git a/doc/latex/TOP/subfiles/model_structure.tex b/doc/latex/TOP/subfiles/model_structure.tex
index 4b356f10abb68169d36da140f58b6548cdddebe0..cd4376753b55113681d3a4faeda84c9c4b60637d 100644
--- a/doc/latex/TOP/subfiles/model_structure.tex
+++ b/doc/latex/TOP/subfiles/model_structure.tex
@@ -35,89 +35,32 @@ and the following modules are available:
\pagebreak
-The workflow of the TOP interface within the NEMO framework is organized around two main blocks of the code, the initialization (trc\_ini) and time marching (trc\_stp) procedures, as in the following
-
-\begin{minted}{bash}
-nemogcm
- !
- nemo_ini ! NEMO General Initialisations
- !
- trc_ini ! TOP Initialisations
- !
- stp() ! NEMO Time-stepping
- !
- trc_stp() ! TOP time-stepping
- !
- trc_wri() ! I/O manager : Output of passive tracers
- trc_sms() ! Sinks and sources program manager
- trc_trp() ! Transport of passive tracers
- trc_rst_wri() ! Write tracer restart file
- trd_mxl_trc() ! trends: Mixed-layer
-\end{minted}
-
-\subsection*{Model initialization (./src/TOP/trcini.F90)}
-
-This module consists on inital set up of passive tracers variables and parameters : read the namelist, set initial tracer fields (either read restart or read data or analytical formulation and specific initailisation in each SMS module ( analytical initialisation of tracers or constant values )
-
-\begin{minted}{bash}
-trc_init ! TOP Initialisations
- !
- IF( PISCES ) trc_ini_pisces() ! PISCES bio model
- IF( MY_TRC) trc_ini_my_trc() ! MY_TRC model
- IF( CFCs ) trc_ini_cfc () ! CFCs
- IF( C14 ) trc_ini_c14 () ! C14 model
- IF( AGE ) trc_ini_age () ! AGE tracer
- !
- IF( REST ) trc_rst_read() ! Restart from a file
- ELSE trc_dta() ! Initialisation from data
-\end{minted}
-
-\subsection*{BGC trends computation (./src/TOP/trcsms.F90)}
-
-This is the main module where the passive tracers source minus sinks of each TOP sub-module is managed.
-
-\begin{minted}{bash}
-trc_sms() ! Sinks and sources prooram manager
- !
- IF( PISCES ) trc_sms_pisces() ! main program of PISCES
- IF( CFCs ) trc_sms_cfc() ! surface fluxes of CFC
- IF( C14 ) trc_sms_c14() ! surface fluxes of C14
- IF( AGE ) trc_sms_age() ! Age tracer
- IF( MY_TRC) trc_sms_my_trc() ! MY_TRC tracers
-\end{minted}
-
-\subsection*{Physical trends computation (./src/TOP/TRP/trctrp.F90)}
-
-This is the main module where the passive tracers transport is managed. All the physical trends is calculated ( advective \& diffusive trends, surface BC from freshwater or external inputs )
-
-\begin{minted}{bash}
-trc_trp() ! Transport of passive tracers
- !
- trc_sbc() ! Surface boundary condition of freshwater flux
- trc_bc() ! Surface and lateral Boundary Conditions
- trc_ais() ! Tracers from Antarctic Ice Sheet (icb, isf)
- trc_bbl() ! Advective (and/or diffusive) bottom boundary layer scheme
- trc_dmp() ! Internal damping trends
- trc_bdy() ! BDY damping trends
- trc_adv() ! Horizontal & Vertical advection
- trc_ldf() ! Lateral mixing
- trc_zdf() ! Vert. mixing & after tracer
- trc_atf() ! Time filtering of "now" tracer fields
- trc_rad() ! Correct artificial negative concentrations
-\end{minted}
-
-\subsection*{Outputs (./src/TOP/TRP/trcwri.F90)}
-
-This is the main module where the passive tracer outputs of each TOP sub-module is managed using the I/O library XIOS.
-
-\begin{minted}{bash}
-trc_wri() ! I/O manager : Output of passive tracers
-!
-IF( PISCES ) trc_wri_pisces() ! Output of PISCES diagnostics
-IF( CFCs ) trc_wri_cfc() ! Output of Cfcs diagnostics
-IF( C14 ) trc_wri_c14() ! surface fluxes of C14
-IF( AGE ) trc_wri_age() ! Age tracer
-IF( MY_TRC ) trc_wri_my_trc() ! MY_TRC tracers
-\end{minted}
+% the following figures are screenshot of the mermaid plot genereted when accessing TOP/figures/workflow.md within gitlab
+% this plots should be rewritten, e.g., using tikz graphic package
+
+The workflow of the TOP interface within the NEMO framework is organized around two main blocks of the code, the initialization (\autoref{fig:topinit}) and time marching or "stepping" (\autoref{fig:topstep}) procedures.\\
+
+The initialization (\forcode{trc_init}) of passive tracers variables and parameters include reading namelist, set initial tracer fields (either read restart or read data), and specific initialisation for each SMS module.
+
+\begin{figure}[ht]
+\begin{center}
+\vspace{0cm}
+\includegraphics[width=0.75\textwidth]{TOP_init}
+\caption{TOP interface initialization workflow (called by nemo\_ini in \forcode{OCE/nemogcm.F90})}
+\label{fig:topinit}
+\end{center}
+\end{figure}
+
+In the time-marching procedure of the model (trc\_stp), trends are computed for all tracers in relation to biogeochemical processes (source minus sinks of each TOP sub-module),
+physical transport (advective \& diffusive, forcing and boundary conditions) and output is managed using the I/O library XIOS.
+
+\begin{figure}[ht]
+\begin{center}
+\vspace{0cm}
+\includegraphics[width=0.75\textwidth]{TOP_step}
+\caption{TOP interface time-marching workflow (called by stp in \forcode{OCE/step.F90}}
+\label{fig:topstep}
+\end{center}
+\end{figure}
\end{document}