diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..7e99e367f8443d86e5e8825b9fda39dfbb39630d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc
\ No newline at end of file
diff --git a/__pycache__/RotTable.cpython-37.pyc b/__pycache__/RotTable.cpython-37.pyc
index 306bef3707a8dfe8d997aa52208ffe660f6a4161..ccf958ba277ca366d89cf83b8e58b711de1f8fe4 100644
Binary files a/__pycache__/RotTable.cpython-37.pyc and b/__pycache__/RotTable.cpython-37.pyc differ
diff --git a/croisement.py b/croisement.py
index 48a399f3e03e49d46867b53a1695e99657f13c67..2bdb485cc5acfb57439e45e856e88296edb25876 100644
--- a/croisement.py
+++ b/croisement.py
@@ -18,7 +18,7 @@ ROT_TABLE = {\
         "TA": [36, 0.9, 0, 1.1, 2, 0],\
         "TC": [36.9, 5.3, -120, 0.9, 6, 0],\
         "TG": [34.5, 3.5, 64, 0.9, 34, 0],\
-        "TT": [35.62, 7.2, -154, 0.06, 0.6, 0]\
+        "TT": [35.62, 7.2, 154, 0.06, 0.6, 0]\
             }