diff --git a/lcviz/helper.py b/lcviz/helper.py
index 143d076..51d76fe 100644
--- a/lcviz/helper.py
+++ b/lcviz/helper.py
@@ -17,10 +17,11 @@
 @unit_converter('custom-lcviz')
 class UnitConverter:
     def equivalent_units(self, data, cid, units):
-        return set(list(map(str, u.Unit(units).find_equivalent_units(
-                    include_prefix_units=True, equivalencies=u.spectral()))))
+        print("*** equivalent_units", cid, units, set(list(map(str, u.Unit(units).find_equivalent_units(include_prefix_units=True)))))
+        return set(list(map(str, u.Unit(units).find_equivalent_units(include_prefix_units=True))))
 
     def to_unit(self, data, cid, values, original_units, target_units):
+        print("*** to_unit", cid, original_units, target_units)
         return (values * u.Unit(original_units)).to_value(u.Unit(target_units))