Improve interval readability

app.py

@@ -244,11 +244,11 @@ def select_columns(df: pd.DataFrame, columns: list) -> pd.DataFrame:
 
 NUMERIC_INTERVALS = {
     "Unknown": pd.Interval(-1, 0, closed="right"),
-    "~3B": pd.Interval(0, 3, closed="right"),
-    "~7B": pd.Interval(3, 7, closed="right"),
-    "~13B": pd.Interval(7, 13, closed="right"),
-    "~35B": pd.Interval(13, 35, closed="right"),
-    "~60B": pd.Interval(35, 60, closed="right"),
+    "0~3B": pd.Interval(0, 3, closed="right"),
+    "3~7B": pd.Interval(3, 7, closed="right"),
+    "7~13B": pd.Interval(7, 13, closed="right"),
+    "13~35B": pd.Interval(13, 35, closed="right"),
+    "35~60B": pd.Interval(35, 60, closed="right"),
     "60B+": pd.Interval(60, 10000, closed="right"),
 }