Fixed the CrossCorrelation,LombScargle

satshed the notebooks (as suggested ) and edited the specific cells that were causing issues

CrossCorrelation/cross_correlation_notebook.ipynb

@@ -969,6 +969,7 @@
    },
    "outputs": [],
    "source": [
+    "from stingray import AutoCorrelation #importing AutoCorrelation\n",
     "dt = 0.001  # seconds\n",
     "exposure = 20.  # seconds\n",
     "freq = 1   # Hz\n",

LombScargle/LombScargleCrossspectrum_tutorial.ipynb

@@ -9,6 +9,16 @@
     "This tutorial shows how to make and manipulate a Lomb Scargle cross spectrum of two light curves using Stingray."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# we can see the new Valid seaborn Styles by running: \n",
+    "#plt.style.available "
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,
@@ -21,8 +31,9 @@
     "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')# removed the earlier seaborn-talk dependency\"\n",
     "%matplotlib inline\n",
+    "from matplotlib.font_manager import FontProperties #Not importing this was causing Import error\n",
     "font_prop = font_manager.FontProperties(size=16)"
    ]
   },

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)"
    ]
   },