diff --git a/notebooks/03-gravity/fwd_gravity_anomaly_3d.ipynb b/notebooks/03-gravity/fwd_gravity_anomaly_3d.ipynb
index 261ef8ca..494b4caf 100644
--- a/notebooks/03-gravity/fwd_gravity_anomaly_3d.ipynb
+++ b/notebooks/03-gravity/fwd_gravity_anomaly_3d.ipynb
@@ -76,6 +76,8 @@
    },
    "outputs": [],
    "source": [
+    "import os\n",
+    "\n",
     "# SimPEG functionality\n",
     "from simpeg.potential_fields import gravity\n",
     "from simpeg.utils import plot2Ddata, model_builder\n",
@@ -90,10 +92,8 @@
     "from scipy.interpolate import LinearNDInterpolator\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
-    "import os\n",
     "\n",
     "mpl.rcParams.update({\"font.size\": 14})\n",
-    "\n",
     "save_output = False  # Optional"
    ]
   },
diff --git a/notebooks/03-gravity/fwd_gravity_gradiometry_3d.ipynb b/notebooks/03-gravity/fwd_gravity_gradiometry_3d.ipynb
index 1fc42f8f..bd904941 100644
--- a/notebooks/03-gravity/fwd_gravity_gradiometry_3d.ipynb
+++ b/notebooks/03-gravity/fwd_gravity_gradiometry_3d.ipynb
@@ -95,7 +95,6 @@
     "import matplotlib.pyplot as plt\n",
     "\n",
     "mpl.rcParams.update({\"font.size\": 14})\n",
-    "\n",
     "save_output = False  # Optional"
    ]
   },
diff --git a/notebooks/04-magnetics/fwd_magnetics_induced_3d.ipynb b/notebooks/04-magnetics/fwd_magnetics_induced_3d.ipynb
index 73c40c22..e16d24f2 100644
--- a/notebooks/04-magnetics/fwd_magnetics_induced_3d.ipynb
+++ b/notebooks/04-magnetics/fwd_magnetics_induced_3d.ipynb
@@ -77,6 +77,8 @@
    },
    "outputs": [],
    "source": [
+    "import os\n",
+    "\n",
     "# SimPEG functionality\n",
     "from simpeg.potential_fields import magnetics\n",
     "from simpeg.utils import plot2Ddata, model_builder\n",
@@ -91,10 +93,8 @@
     "from scipy.interpolate import LinearNDInterpolator\n",
     "import matplotlib as mpl\n",
     "import matplotlib.pyplot as plt\n",
-    "import os\n",
     "\n",
     "mpl.rcParams.update({\"font.size\": 14})\n",
-    "\n",
     "save_output = False  # Optional"
    ]
   },
diff --git a/notebooks/04-magnetics/fwd_magnetics_mvi_3d.ipynb b/notebooks/04-magnetics/fwd_magnetics_mvi_3d.ipynb
index 7e9b0f65..46ee8b00 100644
--- a/notebooks/04-magnetics/fwd_magnetics_mvi_3d.ipynb
+++ b/notebooks/04-magnetics/fwd_magnetics_mvi_3d.ipynb
@@ -95,7 +95,6 @@
     "import matplotlib.pyplot as plt\n",
     "\n",
     "mpl.rcParams.update({\"font.size\": 14})\n",
-    "\n",
     "save_output = False  # Optional"
    ]
   },
diff --git a/notebooks/12-pgi-inversion/plot_inv_1_joint_pf_pgi_full_info_tutorial.ipynb b/notebooks/12-pgi-inversion/plot_inv_1_joint_pf_pgi_full_info_tutorial.ipynb
index 63480b83..76b26cd5 100644
--- a/notebooks/12-pgi-inversion/plot_inv_1_joint_pf_pgi_full_info_tutorial.ipynb
+++ b/notebooks/12-pgi-inversion/plot_inv_1_joint_pf_pgi_full_info_tutorial.ipynb
@@ -486,7 +486,8 @@
     "    covariance_type=\"diag\",  # diagonal covariances\n",
     ")\n",
     "# required: initialization with fit\n",
-    "# fake random samples, size of the mesh, number of physical properties: 2 (density and mag.susc)\n",
+    "# fake random samples, size of the mesh,\n",
+    "# number of physical properties: 2 (density and mag.susc)\n",
     "rng = np.random.default_rng(seed=518936)\n",
     "gmmref.fit(rng.normal(size=(nactv, 2)))\n",
     "# set parameters manually\n",