diff --git a/src/Cargo.lock b/src/Cargo.lock
index d3a61d54..9bf84ff4 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -1793,7 +1793,7 @@ dependencies = [
 
 [[package]]
 name = "obikmer"
-version = "1.1.44"
+version = "1.2.0"
 dependencies = [
  "clap",
  "csv",
diff --git a/src/obikmer/Cargo.toml b/src/obikmer/Cargo.toml
index 903c69db..34b4c9e3 100644
--- a/src/obikmer/Cargo.toml
+++ b/src/obikmer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "obikmer"
-version = "1.1.44"
+version = "1.2.0"
 edition = "2024"
 
 [[bin]]
diff --git a/src/obikmer/src/cmd/phylo/tnt.rs b/src/obikmer/src/cmd/phylo/tnt.rs
index c3c13a08..334a8f16 100644
--- a/src/obikmer/src/cmd/phylo/tnt.rs
+++ b/src/obikmer/src/cmd/phylo/tnt.rs
@@ -46,6 +46,10 @@ pub(super) fn write_sankoff_tnt(
 
     let n_sites = alignment.sequences.first().map(|s| s.len()).unwrap_or(0);
     writeln!(f, "xread").unwrap();
+    writeln!(f, "mxram 16000;").unwrap();
+    writeln!(f, "taxname =;").unwrap();
+    writeln!(f, "taxname +50;").unwrap();
+
     writeln!(
         f,
         "'obikmer central-position SNP families, calibrated Sankoff 16-state encoding'"
@@ -166,9 +170,7 @@ pub(super) fn write_sankoff_tnt(
     writeln!(f, ";").unwrap();
     writeln!(f, "hold 20;").unwrap();
     writeln!(f, "mult;").unwrap();
-    writeln!(f, "taxname =;").unwrap();
-    writeln!(f, "tsave * {tre_name};").unwrap();
-    writeln!(f, "tsave /;").unwrap();
+    writeln!(f, "export - {tre_name};").unwrap();
 
     info!(
         "TNT script → {path} (costs scaled x{cost_scale:.0}, runs a default `hold 20; mult;` \