3 files changed, 3 insertions, 3 deletions
diff --git a/fg21sim/galactic/freefree.py b/fg21sim/galactic/freefree.py
index ffce01a..41e84e6 100644
--- a/fg21sim/galactic/freefree.py
+++ b/fg21sim/galactic/freefree.py
@@ -175,7 +175,7 @@ class FreeFree:
         """
         header = fits.Header()
         header["COMP"] = (self.name, "Emission component")
-        header["UNIT"] = ("Kelvin", "Map unit")
+        header["BUNIT"] = ("K", "data unit is Kelvin")
         header["CREATOR"] = (__name__, "File creator")
         # TODO:
         history = []
diff --git a/fg21sim/galactic/snr.py b/fg21sim/galactic/snr.py
index 02103d3..6897ce4 100644
--- a/fg21sim/galactic/snr.py
+++ b/fg21sim/galactic/snr.py
@@ -349,7 +349,7 @@ class SuperNovaRemnants:
         """
         header = fits.Header()
         header["COMP"] = (self.name, "Emission component")
-        header["UNIT"] = ("Kelvin", "Map unit")
+        header["BUNIT"] = ("K", "data unit is Kelvin")
         header["CREATOR"] = (__name__, "File creator")
         # TODO:
         history = []
diff --git a/fg21sim/galactic/synchrotron.py b/fg21sim/galactic/synchrotron.py
index 7c9f465..f6b1db8 100644
--- a/fg21sim/galactic/synchrotron.py
+++ b/fg21sim/galactic/synchrotron.py
@@ -145,7 +145,7 @@ class Synchrotron:
         """
         header = fits.Header()
         header["COMP"] = (self.name, "Emission component")
-        header["UNIT"] = ("Kelvin", "Map unit")
+        header["BUNIT"] = ("K", "data unit is Kelvin")
         header["CREATOR"] = (__name__, "File creator")
         # TODO:
         history = []