diff --git a/stats_panel.qmd b/stats_panel.qmd
index 8d8d3c2..5f2b140 100644
--- a/stats_panel.qmd
+++ b/stats_panel.qmd
@@ -36,13 +36,19 @@ registerS3method("knit_print", "list", printer_tabset)
 source("utils.R")
 library(biomformat)
 library(phyloseq)
+library(tidytree)
+library(treeio)
 library(ggplot2)
+library(ggtree)
 library(tidyverse)
 library(R.utils)
 library(sbm)
 library(blockmodels)
 
 the_data <- import_biom("data/chaillou/chaillou.biom")
+the_tree <- read.newick("data/chaillou/tree.nwk")
+
+ggtree(the_tree, aes(x, y)) + geom_tree() + theme_tree()
 
 taxa_names <- c("Kingdom", "Phylum", "Class", "Order", "Family", "Genus", "Species/OTU")
 
@@ -84,6 +90,75 @@ names(otu_table_plot) <- taxa_names
 otu_table_plot
 ```
 
+```{r}
+# Below the graph of taxa abundance
+# otus <- per_taxa_no_names <- collapse_otu_at_taxo(phylo_data = the_data, renameOTUs = FALSE)
+otu_mat <- as(otu_table(the_data), "matrix")
+
+if (!taxa_are_rows(the_data)) {
+    otu_mat <- t(otu_mat)
+}
+
+taxa_abund <- rowSums(otu_mat)
+
+abund_df <- tibble(
+    label = names(otu_abund), # MUST match tree tip labels
+    abundance = as.numeric(otu_abund)
+)
+stopifnot(max(abund_df$abundance) > 0)
+tree_tbl <- as_tibble(the_tree) %>%
+    left_join(abund_df, by = "label") %>%
+    mutate(abundance = replace_na(abundance, 0))
+
+## ===============================
+## Step 4 — Aggregate abundance up to the root
+## ===============================
+for (i in seq_len(nrow(tree_tbl))) {
+    parent <- tree_tbl$parent[i]
+    if (!is.na(parent)) {
+        tree_tbl$abundance[tree_tbl$node == parent] <-
+            tree_tbl$abundance[tree_tbl$node == parent] +
+            tree_tbl$abundance[i]
+    }
+}
+
+
+## ===============================
+## Step 5 — Log transform (recommended)
+## ===============================
+tree_tbl <- tree_tbl %>%
+    mutate(log_abundance = log10(abundance + 1))
+## ===============================
+## Step 6 — Plot ggtree with edge coloring
+## ===============================
+p <- ggtree(the_tree) %<+% tree_tbl +
+    geom_tree(
+        aes(color = edge_log_abundance),
+        size = 1
+    ) +
+    scale_color_gradient(
+        low = "#FEECE3",
+        high = "red",
+        name = "Log10 abundance"
+    ) +
+    theme_tree()
+
+p
+ggtree(the_tree) %<+% tree_tbl +
+    geom_tree(color = "grey70", size = 0.6) +
+    geom_point(
+        aes(color = log_abundance),
+        size = 2
+    ) +
+    scale_color_gradient(
+        low = "#FEECE3",
+        high = "red",
+        name = "Log10\nabundance"
+    ) +
+    theme_tree()
+
+```
+
 # Standard deviation
 
 ```{r}