diff --git a/Appendix-H-Least-Squares-Filters.ipynb b/Appendix-H-Least-Squares-Filters.ipynb
index 45f58e3c..ada1ee9e 100644
--- a/Appendix-H-Least-Squares-Filters.ipynb
+++ b/Appendix-H-Least-Squares-Filters.ipynb
@@ -20,7 +20,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from __future__ import division, print_function\n",
     "%matplotlib inline"
    ]
   },
@@ -36,7 +35,7 @@
        "        <style>\n",
        "        .output_wrapper, .output {\n",
        "            height:auto !important;\n",
-       "            max-height:100000px; \n",
+       "            max-height:100000px;\n",
        "        }\n",
        "        .output_scroll {\n",
        "            box-shadow:none !important;\n",
@@ -109,7 +108,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,
diff --git a/Appendix-I-Analytic-Evaluation-of-Performance.ipynb b/Appendix-I-Analytic-Evaluation-of-Performance.ipynb
index f2b61572..6af5230f 100644
--- a/Appendix-I-Analytic-Evaluation-of-Performance.ipynb
+++ b/Appendix-I-Analytic-Evaluation-of-Performance.ipynb
@@ -262,47 +262,10 @@
    ],
    "source": [
     "#format the book\n",
-    "from __future__ import division, print_function\n",
     "%matplotlib inline\n",
     "from book_format import load_style\n",
     "load_style()"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "collapsed": true,
-    "jupyter": {
-     "outputs_hidden": true
-    }
-   },
-   "outputs": [],
-   "source": []
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "collapsed": true,
-    "jupyter": {
-     "outputs_hidden": true
-    }
-   },
-   "outputs": [],
-   "source": []
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "collapsed": true,
-    "jupyter": {
-     "outputs_hidden": true
-    }
-   },
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -321,7 +284,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,