diff --git a/.gitignore b/.gitignore
index 033c77a..ecef278 100644
--- a/.gitignore
+++ b/.gitignore
@@ -147,7 +147,7 @@ cython_debug/
 .vscode/
 
 # Raw data files
-atomdb/datasets/*/raw/
+atomdb/datasets/*/db/
 
 # Generated documentation
 docs/source/api/
diff --git a/atomdb/species.py b/atomdb/species.py
index deacf4d..23ef017 100644
--- a/atomdb/species.py
+++ b/atomdb/species.py
@@ -154,9 +154,9 @@ def __init__(self, x, y, log=False):
         self._log = log
         self._obj = CubicSpline(
             x,
-            # Clip y values to >=ε^2 if using log because they have to be above 0;
-            # having them be at least ε^2 seems to work based on my testing
-            np.log(y.clip(min=np.finfo(float).eps ** 2)) if log else y,
+            # Clip y values to >= ε if using log because they have to be above 0;
+            # having them be at least ε seems to work based on my testing
+            np.log(y.clip(min=np.finfo(float).eps)) if log else y,
             axis=0,
             bc_type="not-a-knot",
             extrapolate=True,
@@ -198,8 +198,8 @@ def __call__(self, x, deriv=0):
             y = self._obj(x, nu=deriv)
         # Handle errors from the y = exp(log y) operation -- set NaN to zero
         np.nan_to_num(y, nan=0., copy=False)
-        # Cutoff value: assume y(x) is zero where x >= 2 times final given point x_n
-        y[x > 2 * self._obj.x[-1]] = 0
+        # Cutoff value: assume y(x) is zero where x > final given point x_n
+        y[x > self._obj.x[-1]] = 0
         return y