diff --git a/bpx/schema.py b/bpx/schema.py
index 9d9631a..a017154 100644
--- a/bpx/schema.py
+++ b/bpx/schema.py
@@ -319,10 +319,13 @@ def __init__(self, **data: dict) -> None:
                 data[k] = InterpolatedTable(**v)
         super().__init__(**data)
 
+    @property
+    def extra_fields(self) -> set[str]:
+        return set(self.__dict__) - set(self.model_fields)
+
     @model_validator(mode="before")
     @classmethod
     def validate_extra_fields(cls, values: dict) -> dict:
-        print(values)
         for k, v in values.items():
             if not isinstance(v, get_args(FloatFunctionTable)):
                 error_msg = f"{k} must be of type 'FloatFunctionTable'"