Bugfixes and removed old code

atmospheric refraction example.ipynb

@@ -81,7 +81,6 @@
     }
    ],
    "source": [
-    "# Calculating refraction for edge FoV\n",
     "zenith_obs = 45\n",
     "refraction_obs = ref.cassini(n1, zenith_obs) * 3.6e3\n",
     "print ('The refraction is %.03f arc seconds' %(refraction_obs))"
@@ -104,7 +103,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [
     {
@@ -136,7 +135,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -178,7 +177,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,