diff --git a/.gitignore b/.gitignore
index f197ac0..f365af0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
 .ipynb_checkpoints
 .DS_Store
 .vscode
+*.png
+*.jpg
+*.jpeg
\ No newline at end of file
diff --git a/CrossCorrelation/cross_correlation_notebook.ipynb b/CrossCorrelation/cross_correlation_notebook.ipynb
index 8e26890..a10ba20 100644
--- a/CrossCorrelation/cross_correlation_notebook.ipynb
+++ b/CrossCorrelation/cross_correlation_notebook.ipynb
@@ -969,6 +969,7 @@
    },
    "outputs": [],
    "source": [
+    "from stingray.crosscorrelation import AutoCorrelation\n",
     "dt = 0.001  # seconds\n",
     "exposure = 20.  # seconds\n",
     "freq = 1   # Hz\n",
diff --git a/Deadtime/Check dead time model in Stingray.ipynb b/Deadtime/Check dead time model in Stingray.ipynb
index c90e48b..9b76ba7 100644
--- a/Deadtime/Check dead time model in Stingray.ipynb	
+++ b/Deadtime/Check dead time model in Stingray.ipynb	
@@ -61,7 +61,7 @@
    "outputs": [],
    "source": [
     "def simulate_events(rate, length, deadtime=2.5e-3, **filter_kwargs):\n",
-    "    events = np.random.uniform(0, length, np.int(rate * length))\n",
+    "    events = np.random.uniform(0, length, int(rate * length))\n",
     "    events = np.sort(events)\n",
     "    events_dt = filter_for_deadtime(events, deadtime, **filter_kwargs)\n",
     "    return events, events_dt"
diff --git a/LombScargle/LombScargleCrossspectrum_tutorial.ipynb b/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
index 854f78b..8d23e40 100644
--- a/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
+++ b/LombScargle/LombScargleCrossspectrum_tutorial.ipynb
@@ -21,8 +21,9 @@
     "import numpy as np\n",
     "import matplotlib.pyplot as plt\n",
     "import matplotlib.font_manager as font_manager\n",
-    "plt.style.use('seaborn-talk')\n",
+    "plt.style.use('seaborn-v0_8-talk')\n",
     "%matplotlib inline\n",
+    "from matplotlib.font_manager import FontProperties \n",
     "font_prop = font_manager.FontProperties(size=16)"
    ]
   },
diff --git a/LombScargle/LombScarglePowerspectrum_tutorial.ipynb b/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
index 2fd4f75..b376dfa 100644
--- a/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
+++ b/LombScargle/LombScarglePowerspectrum_tutorial.ipynb
@@ -22,7 +22,7 @@
     "from scipy.interpolate import make_interp_spline\n",
     "import matplotlib.font_manager as font_manager\n",
     "%matplotlib inline\n",
-    "plt.style.use('seaborn-talk')\n",
+    "plt.style.use('seaborn-v0_8-talk')\n",
     "font_prop = font_manager.FontProperties(size=16)"
    ]
   },
diff --git a/Window Functions/window_functions.ipynb b/Window Functions/window_functions.ipynb
index a32f5b5..ea3fd31 100644
--- a/Window Functions/window_functions.ipynb	
+++ b/Window Functions/window_functions.ipynb	
@@ -149,7 +149,7 @@
    ],
    "source": [
     "nfft = 2048\n",
-    "A = fft(uniform_window,nfft ) / (len(uniform_window)/2.0)\n",
+    "A = fft(window,nfft ) / (len(window)/2.0)\n",
     "freq = fftfreq(nfft)\n",
     "response = 20 * np.log10(np.abs(fftshift(A/(abs(A).max()))))\n",
     "plt.plot(freq, response)\n",