diff --git a/authentication.qmd b/authentication.qmd
index b789610..bb6fe2c 100644
--- a/authentication.qmd
+++ b/authentication.qmd
@@ -708,7 +708,7 @@ conda activate authentication
 We navigate to the working directory:
 
 ```bash
-cd metadmg/figures
+cd metadmg/
 ```
 
 We load R by running `R` in your terminal
@@ -738,7 +738,7 @@ We will use the function `get_dmg_decay_fit` to visualise damage pattern (@fig-a
 The function is saved in `metadmg/script/`, so we only need to run the following command to recall it:
 
 ```{r eval=F}
-source("metadmg/script/get_dmg_decay_fit.R")
+source("script/get_dmg_decay_fit.R")
 ```
 
 But if you are curious and want to know how it works, here is the function itself:
@@ -848,10 +848,10 @@ get_dmg_decay_fit <- function(df, orient = "fwd", pos = 30, p_breaks = c(0, 0.1,
 }
 ```
 
-We load our metaDMG output data (tsv file) and generate the damage plots as seen in @fig-authentication-fagusovisdmg using the function `get-damage`.
+We load our metaDMG output data (tsv file) and the metadata with information on the age of each sample. We generate the damage plots as seen in @fig-authentication-fagusovisdmg using the function `get-damage`.
 
 ```{r eval=F}
-df <- read.csv("metadmg/concatenated_metaDMGfinal.tsv",  sep = "\t")
+df <- read.csv("concatenated_metaDMGfinal.tsv",  sep = "\t")
 
 #Rename sample column
 colnames(df)[colnames(df) == 'filename'] <- 'sample'
@@ -864,6 +864,17 @@ df$sample[df$sample == "VM-17_aggregated_results.stat"] <- "VM-17"
 df$sample[df$sample == "VM-19_aggregated_results.stat"] <- "VM-19"
 df$sample[df$sample == "VM-3_aggregated_results.stat"] <- "VM-3"
 
+#Import the metadata with dates BP
+depth_data <- read.csv ("figures/depth_data.csv", header = TRUE)
+View (depth_data)
+
+#Merge context_data and depth_data with dataframe (adding new column for dates BP)
+df$new <- depth_data$Date_BP[match(df$sample, depth_data$Sample_ID)]
+names(df)[names(df) == 'new'] <- 'Date_BP'
+
+# Convert Date_BP columns to factors (categorical variable) 
+df$Date_BP <- as.factor(df$Date_BP)
+
 #Setting filtering theshold for ancient reads
 minDMG = 0.02 # filter criteria, plot only taxa above set value
 zfit = 2 # minimum significance, the higher the better, 2 would mean that we estimante the damage with 95% confidence. 
@@ -881,7 +892,6 @@ X <- tax_g_list
 purrr::map(tax_g_list, function(X, nrank) {
   sel_tax <- dt1 %>%
     rename(label = sample) %>%
-    #filter(Genome_Id %in% (tax_superg %>% filter(Taxa_Super_Groups == X) %>% pull(Genome_Id))) %>%
     filter(name == X) %>%
     filter(rank == rank) %>%
     select(name, label) %>%
@@ -899,7 +909,7 @@ purrr::map(tax_g_list, function(X, nrank) {
       get_dmg_decay_fit(df = dt1 %>% rename(label = sample)  %>% inner_join(sel_tax) %>% filter(rank == rank), orient = "rev", y_max = 0.70) +
         ggtitle(paste0(X, " nreads=", n_readsa, " Reverse"))
     ), align = "hv")
-    ggsave(paste0(X, "-dmg.pdf"), plot = last_plot(), width = 8, height = 4)
+    ggsave(paste0("figures/", X, "-dmg.pdf"), plot = last_plot(), width = 8, height = 4)
   }
 })
 ``` 
@@ -912,61 +922,35 @@ We provide an R script to investigate the main statistics.
 Here we visualise the amplitude of damage (A) and its significance (Zfit), for the full dataset but filtering it to a minimum of 100 reads and at the genus level (@fig-authentication-fig8). 
 
 ```{r eval=F}
-#Subset dataset at genus level
-dt2 <- df %>% filter(grepl("\\bgenus\\b", rank))
-
-#plotting  amplitude of damage vs its significance 
-p1 <- ggplot(dt2, aes(y=A, x=Zfit)) + 
-  geom_point(aes(size=nreads), col ="dark green") +
-  theme(axis.text.x = element_text(angle = 45, vjust = 1, hjust =1)) +
-  scale_size_continuous(labels = function(x) format(x, scientific = FALSE)) +
-  xlab("significance") + ylab("damage") + theme_minimal()
-p1
-
-#Plotting only animals and plants at genus level
-#subset dataset
-dt3 <- dt2 %>% filter(nreads > 100, grepl("\\bgenus\\b", rank), grepl("Metazoa", taxa_path) | grepl("Viridiplant", taxa_path))
+#Subset dataset animal and plants at the genus level
+dt2 <- df %>% filter(nreads > 100, grepl("\\bgenus\\b", rank), grepl("Metazoa", taxa_path) | grepl("Viridiplant", taxa_path))
 
 #Adding factor column for Kingdom
-dt3 <- dt3 %>% 
+dt2 <- dt2 %>% 
   mutate(Kingdom =   # creating our new column
            case_when(grepl("Viridiplant", taxa_path) ~ "Viridiplantae",
                      grepl("Metazoa",taxa_path) ~ "Metazoa"))
 
-#Plotting  amplitude of damage vs its significance 
-p2 <- ggplot(dt3, aes(y=A, x=Zfit)) + 
+#Plotting  amplitude of damage vs its significance and saving as pdf file
+pdf(file = "figures/p1.pdf", width = 8, height = 6)
+ggplot(dt2, aes(y=A, x=Zfit)) + 
   geom_point(aes(size=nreads, col=Kingdom)) +
   theme(axis.text.x = element_text(angle = 45, vjust = 1, hjust =1)) +
   scale_color_manual(values = c("#8B1A1A", "#458B00"))+
   scale_size_continuous(labels = function(x) format(x, scientific = FALSE)) +
   xlab("significance") + ylab("damage") + theme_minimal()
-p2
-
-#Save the plots as a PDF file
-ggsave("p1.pdf", plot = p1, width = 8, height = 6)
-ggsave("p2.pdf", plot = p2, width = 8, height = 6)
+dev.off()
 ``` 
 
 ![Amplitude of damage (A) vs significance (Zfit) for animals and plants.](assets/images/chapters/authentication/p2.png){#fig-authentication-fig8}
 
 ### Amplitude of damage and mean fragment length through time
 
-Here we visualise the amplitude of damage (A) and the mean length of the fragments (mean_rlen) by depth and by date (BP) for the full dataset but filtering it to a minimum of 100 reads and at the genus level (@fig-authentication-fig9).
+Here we visualise the amplitude of damage (A) and the mean length of the fragments (mean_rlen) by date (BP) for the filtered dataset with a minimum of 100 reads and at the genus level (@fig-authentication-fig9).
 
 ```{r eval=F}
-#Import the metadata 
-depth_data <- read.csv ("metadmg/figures/depth_data.csv", sep = ",")
-View (depth_data)
-
-#Merge context_data and depth_data with dataframe (adding new column for dates BP)
-df$new <- depth_data$Date_BP[match(df$sample, depth_data$Sample_ID)]
-names(df)[names(df) == 'new'] <- 'Date_BP'
-
-# Convert Date_BP columns to factors (categorical variable) 
-df$Date_BP <- as.factor(df$Date_BP)
-
 #Plotting damage (A) by period (dates BP)
-p3a<- dt4 %>%
+p2a<- dt2 %>%
   mutate(Date_BP = fct_relevel(Date_BP,
                              "6100","5300","4100","3900","3000", "800")) %>%
   ggplot(aes(x=A, y=Date_BP))+ 
@@ -974,10 +958,10 @@ p3a<- dt4 %>%
   geom_point(aes(fill = sample), size = 3, shape = 21, color = "black", stroke = .5) +
   scale_x_continuous(limits = c(0, 0.20), breaks = seq(0, 0.20, by = 0.05)) +
   theme_minimal() + theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
-p3a
+p2a
 
 #Plotting mean length (mean_rlen) by period (dates BP)
-p3b<- dt4 %>%
+p2b<- dt2 %>%
   mutate(Date_BP = fct_relevel(Date_BP,
                              "6100","5300","4100","3900","3000", "800")) %>%
   ggplot(aes(x=mean_rlen, y=Date_BP))+ 
@@ -985,15 +969,13 @@ p3b<- dt4 %>%
   geom_point(aes(fill = sample), size = 3, shape = 21, color = "black", stroke = .5) +
   scale_x_continuous(limits = c(30, 80), breaks = seq(30, 80, by = 10)) +
   theme_minimal() + theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))
-p3b
+p2b
 
-#Combining the plots
-p3 <- grid.arrange(p3a, p3b,
+#Combining the plots and saving as pdf file
+pdf(file = "figures/p2.pdf", width = 8, height = 6)
+p2 <- grid.arrange(p2a, p2b,
                    ncol = 2, nrow = 1)
-p3
-
-#Save plot
-ggsave("p3.pdf", plot = p4, width = 10, height = 8)
+dev.off()
 ``` 
 
 ![Amplitude of damage (A) and mean fragment length (mean_rlen) through time.](assets/images/chapters/authentication/p3.png){#fig-authentication-fig9}