diff --git a/plotting/matrix.R b/plotting/matrix.R
index 381136047ba1ed8037569f631570d3bc0c38d9c3..fefdde0e9a7f8afb47ef2bf400538d54f9fd37aa 100644
--- a/plotting/matrix.R
+++ b/plotting/matrix.R
@@ -452,13 +452,17 @@ matrix_panel = function (list_df2plot, df_meta, trend_period, mean_period, slice
             title = df_meta[df_meta$code == subCode[1],]$region_hydro
             
             ### Plot ###
+            # Fixes the height and width of the table according to
+            # the number of station and the number of column to draw
             height = nsubCode
             width = nbp * 2 * nPeriod_trend + nPeriod_trend + nPeriod_mean * nbp + nPeriod_mean + nbp        
-            
+
+            # Fixes the size of the plot area to keep proportion right
             options(repr.plot.width=width, repr.plot.height=height)
-            
+
+            # Open a new plot with a personalise theme
             mat = ggplot() + theme_ash + 
-                
+                # Modification of theme in order to remove axis
                 theme(
                     panel.border=element_blank(),
                     axis.text.x=element_blank(),
@@ -468,23 +472,22 @@ matrix_panel = function (list_df2plot, df_meta, trend_period, mean_period, slice
                     axis.title.y=element_blank(),
                     plot.margin=margin(t=5, r=5, b=5, l=5, unit="mm")
                 )
-            
+            # Postion and name of the title
             xt = 1 - 6
             yt = height + 2
             Title = bquote(bold(.(title)))
-            
+            # Writes the title
             mat = mat +
                 annotate("text", x=xt, y=yt,
                          label=Title,
                          hjust=0, vjust=1, 
                          size=6, color="#00A3A8")
 
-
-            
             ### Trend ###
             # For all the trend period
             for (j in 1:nPeriod_trend) {
-
+                # Extracts the info to plot associated to the
+                # right period
                 Type_trend_per =
                     subType_trend[subNPeriod_trend == j]
                 Code_trend_per =
@@ -499,111 +502,135 @@ matrix_panel = function (list_df2plot, df_meta, trend_period, mean_period, slice
                     subFill_trend[subNPeriod_trend == j]
                 Color_trend_per =
                     subColor_trend[subNPeriod_trend == j]
-                
-                Xtmp = as.integer(factor(as.character(Type_trend_per)))
 
-                Xc = j + (j - 1)*nbp*2        
+                # Converts the vector of hydrological variable to
+                # a vector of integer associated to those variable
+                Xtmp = as.integer(factor(as.character(Type_trend_per)))
+                # Computes X position of the column of the period dates
+                Xc = j + (j - 1)*nbp*2
+                # Computes X positions of columns of the mean of
+                # variables
                 Xm = Xtmp + (j - 1)*nbp*2 + j
+                # Computes X positions of columns of the mean trend
                 X = Xtmp + (j - 1)*nbp*2 + nbp + j
-
+                
+                # Computes Y positions of each line for each station
                 Y = as.integer(factor(Code_trend_per))
 
+                # Position of a line to delimite periods
                 x = Xc - 0.4
                 xend = X[length(X)] + 0.25
                 y = height + 1
                 yend = height + 1
-
+                # Drawing of the line
                 mat = mat +
                     annotate("segment",
                              x=x, xend=xend,
                              y=y, yend=yend, 
                              color="grey40", size=0.35)
-                
+
+                # Position of the name of the current period
                 yt = y + 0.15
                 Start = trend_period[[j]][1]
                 End = trend_period[[j]][2]
+                # Name of the period
                 periodName = bquote(bold('Période')~bold(.(as.character(j))))
-
+                # Naming the period
                 mat = mat +
                     annotate("text", x=x, y=yt,
                              label=periodName,
                              hjust=0, vjust=0.5, 
                              size=3, color='grey40')
-                
+
+                # For all the variable
                 for (i in 1:length(X)) {
                     mat = mat +
-                        
+                        # Plots circles for mean trends
                         gg_circle(r=0.45, xc=X[i], yc=Y[i],
                                   fill=Fill_trend_per[i],
                                   color=Color_trend_per[i]) +
-                        
+                        # Plots circles for mean of variables
                         gg_circle(r=0.45, xc=Xm[i], yc=Y[i],
                                   fill='white', color='grey40') +
-                        
+                        # Plots circles for the column of period dates
                         gg_circle(r=0.45, xc=Xc, yc=Y[i],
                                   fill='white', color='grey40') 
                 }
-                
+                # For all the mean trend on this period
                 for (i in 1:length(TrendMean_trend_per)) {
+                    # Extracts the value of the mean trend
                     trendMean = TrendMean_trend_per[i]
-                    trendC = signif(trendMean*100, 2)
+                    # Converts it to the right format with two
+                    # significant figures
+                    trendMeanC = signif(trendMean*100, 2)
 
+                    # If it is significative
                     if (!is.na(Pthresold_trend_per[i])) {
+                        # The text color is white
                         Tcolor = 'white'
+                    # Otherwise
                     } else {
+                        # The text is grey
                         Tcolor = 'grey85'
                     }
                     
-                    dataMean = signif(DataMean_trend_per[i], 2)
+                    # Same for the mean of a variable over
+                    # the current period
+                    dataMean = DataMean_trend_per[i]
+                    dataMeanC = signif(dataMean, 2)
 
                     mat = mat +
+                        # Writes the mean trend
                         annotate('text', x=X[i], y=Y[i],
-                                 label=trendC,
+                                 label=trendMeanC,
                                  hjust=0.5, vjust=0.5, 
                                  size=3, color=Tcolor) + 
-                        
+                        # Writes the mean of the associated variable
                         annotate('text', x=Xm[i], y=Y[i],
-                                 label=dataMean,
+                                 label=dataMeanC,
                                  hjust=0.5, vjust=0.5, 
                                  size=3, color='grey40')
                 }
                 
                 mat = mat +
+                    # Writes a name for the period dates column
                     annotate('text', x=Xc, y=max(Y) + 0.85,
                              label=bquote(bold('Début')),
                              hjust=0.5, vjust=0.5, 
                              size=3, color='grey20') + 
-                    
                     annotate('text', x=Xc, y=max(Y) + 0.6,
                              label=bquote(bold('Fin')),
                              hjust=0.5, vjust=0.5, 
                              size=3, color='grey20')
+                
                 # For all variable
                 for (i in 1:nbp) {
                     # Extract the variable of the plot
                     type = list_df2plot[[i]]$type
                     mat = mat +
+                        # Writes the type of the variable
                         annotate('text', x=X[i], y=max(Y) + 0.82,
                                  label=bquote(.(type)),
                                  hjust=0.5, vjust=0.5, 
                                  size=3.25, color='grey20') +
-                        
+                        # Writes the unit of the variable
                         annotate('text', x=X[i], y=max(Y) + 0.6,
                                  label=bquote('[%.'*ans^{-1}*']'),
                                  hjust=0.5, vjust=0.5, 
                                  size=2, color='grey40') +
-                        
+                        # Writes the type of the mean variable
                         annotate('text', x=Xm[i], y=max(Y) + 0.82,
                                  label=bquote('µ'*.(type)),
                                  hjust=0.5, vjust=0.5, 
                                  size=3.25, color='grey20') +
-                        
+                        # Writes the unit of the mean variable
                         annotate('text', x=Xm[i], y=max(Y) + 0.6,
                                  label=bquote('['*m^3*'.'*s^{-1}*']'),
                                  hjust=0.5, vjust=0.5, 
                                  size=2, color='grey40')
                 }
 
+                # For all the station on the page
                 for (k in 1:nsubCode) {
                     # Gets the code
                     code = subCode[k]
diff --git a/script.R b/script.R
index 6fd729592d562e0ce4f2eac244a531c4b14d8e16..a611f7a4d8931ef776db4dc451a86c4128869a6c 100644
--- a/script.R
+++ b/script.R
@@ -175,7 +175,7 @@ if (AGlistname != ""){
     filename = df_selec_AG[df_selec_AG$ok,]$filename
 
     #####
-    # filename = filename[(1):(25)]
+    # filename = filename[(1):(10)]
     #####
 
     # Extract metadata about selected stations