diff --git a/notebooks/acs_cte_forward_model_example.ipynb b/notebooks/acs_cte_forward_model_example.ipynb
index 03fd6ec..7c1a272 100644
--- a/notebooks/acs_cte_forward_model_example.ipynb
+++ b/notebooks/acs_cte_forward_model_example.ipynb
@@ -105,7 +105,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%matplotlib notebook\n",
     "import os\n",
     "import shutil\n",
     "import glob\n",
@@ -182,7 +181,7 @@
    "source": [
     "os.environ['CRDS_SERVER'] = 'https://hst-crds.stsci.edu'\n",
     "os.environ['CRDS_PATH'] = './crds_cache'\n",
-    "os.environ['JREF'] = './crds_cache/references/hst/acs/'\n",
+    "os.environ['jref'] = './crds_cache/references/hst/acs/'\n",
     "\n",
     "!crds bestrefs --update-bestrefs --sync-references=1 --files jd0q14ctq_flc.fits"
    ]
@@ -221,13 +220,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# The JREF environment variable gives the directory containing the reference files\n",
-    "flat_hdu = fits.open('{}/{}'.format(os.environ['JREF'],flat))\n",
+    "# The jref environment variable gives the directory containing the reference files\n",
+    "flat_hdu = fits.open('{}/{}'.format(os.environ['jref'],flat))\n",
     "\n",
     "flat_wfc1 = flat_hdu[4].data\n",
     "flat_wfc2 = flat_hdu[1].data\n",
     "\n",
-    "dkc_hdu = fits.open('{}/{}'.format(os.environ['JREF'],dkc))\n",
+    "dkc_hdu = fits.open('{}/{}'.format(os.environ['jref'],dkc))\n",
     "\n",
     "dkc_wfc1 = dkc_hdu[4].data\n",
     "dkc_wfc2 = dkc_hdu[1].data\n",
@@ -237,7 +236,7 @@
     "dkc_wfc1[dkc_wfc1 < 0.] = 0.\n",
     "dkc_wfc2[dkc_wfc2 < 0.] = 0.\n",
     "\n",
-    "bias_hdu = fits.open('{}/{}'.format(os.environ['JREF'],bias))\n",
+    "bias_hdu = fits.open('{}/{}'.format(os.environ['jref'],bias))\n",
     "\n",
     "err_bias_wfc1 = bias_hdu[5].data\n",
     "err_bias_wfc2 = bias_hdu[2].data\n",
@@ -245,7 +244,7 @@
     "dq_bias_wfc1 = bias_hdu[6].data\n",
     "dq_bias_wfc2 = bias_hdu[3].data\n",
     "\n",
-    "# flash_dhu = fits.open('{}/{}'.format(os.environ['JREF'],flash))\n",
+    "# flash_dhu = fits.open('{}/{}'.format(os.environ['jref'],flash))\n",
     "\n",
     "# flash_wfc1 = flash_hdu[4].data\n",
     "# flash_wfc2 = flash_hdu[1].data"