diff --git a/sample/03_finite_temperature/calcspec.py b/sample/03_finite_temperature/calcspec.py
index b25b228d..10c9a268 100644
--- a/sample/03_finite_temperature/calcspec.py
+++ b/sample/03_finite_temperature/calcspec.py
@@ -13,5 +13,5 @@ def spec(name):
             f.write(f"{b} {C}\n")
 
 
-for name in ("weak", "middle", "strong"):
+for name in ("weak", "middle", "strong", "zero"):
     spec(name)