diff --git a/LombScargle/LombScargleCrossspectrum_tutorial.ipynb b/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
index 8d23e40..b11b6ee 100644
--- a/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
+++ b/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
@@ -143,10 +143,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import sys\n",
     "lcs = LombScargleCrossspectrum(\n",
     "    lc1,\n",
     "    lc2,\n",
-    "    min_freq=0,\n",
+    "    min_freq=sys.float_info.epsilon,\n",
     "    max_freq=None,\n",
     "    method=\"fast\",\n",
     "    power_type=\"all\",\n",
@@ -300,9 +301,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.8"
+   "version": "3.9.12"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/LombScargle/LombScarglePowerspectrum_tutorial.ipynb b/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
index b376dfa..d041c77 100644
--- a/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
+++ b/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
@@ -123,9 +123,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import sys\n",
     "lps = LombScarglePowerspectrum(\n",
     "    lc,\n",
-    "    min_freq=0,\n",
+    "    min_freq=sys.float_info.epsilon,\n",
     "    max_freq=None,\n",
     "    method=\"fast\",\n",
     "    power_type=\"all\",\n",