diff --git a/swvo/io/RBMDataSet/RBMDataSet.py b/swvo/io/RBMDataSet/RBMDataSet.py
index 91de5e7..c6c7a01 100644
--- a/swvo/io/RBMDataSet/RBMDataSet.py
+++ b/swvo/io/RBMDataSet/RBMDataSet.py
@@ -228,6 +228,15 @@ def __getattr__(self, name: str) -> NDArray[np.float64]:
 
         raise AttributeError(msg)
 
+    def load(self, name_or_var: str | VariableEnum) -> None:
+        """ Load data into memory """
+
+        if isinstance(name_or_var, VariableEnum):
+            getattr(self, name_or_var.var_name)
+        else:
+            getattr(self, name_or_var)
+
+
     def find_similar_variable(self, name: str) -> tuple[None | VariableEnum, dict[str, Any]]:
         levenstein_info: dict[str, Any] = {"min_distance": 10, "var_name": ""}
         sat_variable = None
diff --git a/swvo/io/RBMDataSet/RBMNcDataSet.py b/swvo/io/RBMDataSet/RBMNcDataSet.py
index a172ab4..d4862cf 100644
--- a/swvo/io/RBMDataSet/RBMNcDataSet.py
+++ b/swvo/io/RBMDataSet/RBMNcDataSet.py
@@ -110,6 +110,28 @@ def __init__(
             verbose=verbose,
         )
 
+        mfm_str = mfm if isinstance(mfm, str) else mfm.mfm_name
+
+        self.variable_lut = {
+            "time": "time",
+            "datetime": "datetime",
+            "flux/FEDU": "Flux",
+            "flux/alpha_eq": "alpha_eq_model",
+            "flux/energy": "energy_channels",
+            "flux/alpha_local": "alpha_local",
+            "position/xGEO": "xGEO",
+            "psd/PSD": "PSD",
+            "density/density_local": "density",
+
+            f"position/{mfm_str}/MLT": "MLT",
+            f"position/{mfm_str}/R0": "R0",
+            f"position/{mfm_str}/Lstar": "Lstar",
+            f"position/{mfm_str}/Lm": "Lm",
+            f"mag_field/{mfm_str}/B_local": "B_total",
+            f"psd/{mfm_str}/inv_mu": "InvMu",
+            f"psd/{mfm_str}/inv_K": "InvK",
+        }
+
     def _create_file_path_stem(self) -> Path:
         # implement special cases here
         # if self._satellite == SatelliteEnum.THEMIS:
@@ -196,20 +218,23 @@ def _load_variable(self, var: Variable | VariableEnum) -> None:
             if var_name == "datetime":
                 loaded_var_arrs[var_name] = list(loaded_var_arrs[var_name])  # ty:ignore[invalid-assignment]
 
-            rbm_var_name = RBMNcDataSet._get_rbm_name(var_name, self._mfm.mfm_name)  # ty:ignore[invalid-argument-type]
+            rbm_var_names = RBMNcDataSet._get_rbm_name(var_name, self._mfm.mfm_name)  # ty:ignore[invalid-argument-type]
 
-            if rbm_var_name is not None:
-                setattr(self, rbm_var_name, loaded_var_arrs[var_name])
+            if rbm_var_names is not None:
+                for name in rbm_var_names:
+                    setattr(self, name, loaded_var_arrs[var_name])
 
     @classmethod
-    def _get_rbm_name(cls, var_name: str, mag_field: MfmEnumLiteral) -> VariableLiteral | None:
+    def _get_rbm_name(cls, var_name: str, mag_field: MfmEnumLiteral) -> VariableLiteral | None | list[VariableLiteral]:
         match var_name:
             case "time":
                 return "time"
             case "datetime":
                 return "datetime"
             case "flux/FEDU":
-                return "Flux"
+                return ["Flux", "FEDU"]
+            case "flux/FEIU":
+                return ["Flux", "FEIU"]
             case "flux/alpha_eq":
                 return "alpha_eq_model"
             case "flux/energy":
diff --git a/swvo/io/RBMDataSet/custom_enums.py b/swvo/io/RBMDataSet/custom_enums.py
index a701106..c42bfdc 100644
--- a/swvo/io/RBMDataSet/custom_enums.py
+++ b/swvo/io/RBMDataSet/custom_enums.py
@@ -57,6 +57,10 @@ class VariableEnum(Variable, Enum):
     P = "P", "mlt", with_B
     R_0 = "R0", "R0", with_B
     DENSITY = "density", "density", without_B
+    # NC only variables
+    FEDU = "FEDU", "", without_B
+    FEIU = "FEIU", "", without_B
+    Lm = "Lm", "", without_B
 
 
 VariableLiteral = Literal[
@@ -72,6 +76,9 @@ class VariableEnum(Variable, Enum):
     "InvV",
     "Lstar",
     "Flux",
+    "FEDU",
+    "FEIU",
+    "Lm",
     "PSD",
     "MLT",
     "B_SM",
diff --git a/swvo/io/RBMDataSet/utils.py b/swvo/io/RBMDataSet/utils.py
index 645fab0..4fb8585 100644
--- a/swvo/io/RBMDataSet/utils.py
+++ b/swvo/io/RBMDataSet/utils.py
@@ -31,8 +31,13 @@ def join_var(var1: NDArray[np.generic], var2: NDArray[np.generic]) -> NDArray[np
 def get_file_path_any_format(folder_path: Path, file_stem: str, preferred_ext: str) -> Path | None:
     """Get the file path for a given file stem and preferred extension."""
     pattern = re.compile(fnmatch.translate(file_stem + ".*"), re.IGNORECASE)
+
+    if not folder_path.exists():
+        return None
+
     all_files = [p for p in folder_path.iterdir() if pattern.match(p.name)]
 
+
     if len(all_files) == 0:
         warnings.warn(f"File not found: {folder_path / (file_stem + '.*')}", stacklevel=2)
         return None
diff --git a/tests/io/RBMDataSet/test_RBMNcDataset.py b/tests/io/RBMDataSet/test_RBMNcDataset.py
index 8850f48..c01190f 100644
--- a/tests/io/RBMDataSet/test_RBMNcDataset.py
+++ b/tests/io/RBMDataSet/test_RBMNcDataset.py
@@ -260,7 +260,7 @@ def test_load_variable_real_file():
 
     assert hasattr(dataset, "alpha_local"), "Dataset should have 'alpha_local' attribute after loading."
     assert isinstance(dataset.alpha_local, np.ndarray), "'alpha_local' should be a NumPy array."
-
+    assert hasattr(dataset, "FEDU")
 
 def test_all_variables_in_dir(mock_dataset: RBMNcDataSet):
     vars = [