fix section headings

Author: adrn

tutorials/notebooks/Coordinates-Intro/Coordinates-Intro.ipynb

@@ -233,7 +233,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Download an image\n",
+    "## Download an image\n",
     "Now that we have a `SkyCoord` object, we can try to use it to access data from the [Sloan Digitial Sky Survey](http://www.sdss.org/) (SDSS).  Let's start by trying to get a picture using the SDSS image cutout service to make sure HCG7 is in the SDSS footprint and has good image quality.\n",
     "\n",
     "This requires an internet connection, but if it fails, don't worry: the file is included in the repository so you can just let it use the local file``'HCG7_SDSS_cutout.jpg'``, defined at the top of the cell.  "
@@ -339,7 +339,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.2"
+   "version": "3.6.4"
   }
  },
  "nbformat": 4,

tutorials/notebooks/Coordinates-Transform/Coordinates-Transform.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Transforming between coordinate systems - Coordinates series 2"
+    "# Transforming between coordinate systems"
    ]
   },
   {
@@ -74,7 +74,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Section 0: Quickstart"
+    "## Section 0: Quickstart"
    ]
   },
   {
@@ -146,7 +146,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Section 1: "
+    "## Section 1: "
    ]
   },
   {
@@ -363,7 +363,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Section 2:"
+    "## Section 2:"
    ]
   },
   {
@@ -716,7 +716,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.2"
+   "version": "3.6.4"
   }
  },
  "nbformat": 4,

tutorials/notebooks/FITS-cubes/FITS-cubes.ipynb

@@ -70,7 +70,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Download the HI Data\n",
+    "## Download the HI Data\n",
     "\n",
     "We will be using HI 21 cm emission data from the [HI4Pi survey](http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1610.06175).  We want to look at neutral gas emission from the Magellanic Clouds, learn about the kinematics of the system and column densities. Using the vizier catalog, we have found a relevant data cube to use covering this region of the sky. You can also download an allsky data cube, but this is a very large file, so picking out sub-sections can be useful!\n",
     "\n",
@@ -220,7 +220,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Make a smaller cube, focusing on the Magellanic Clouds\n",
+    "## Make a smaller cube, focusing on the Magellanic Clouds\n",
     "\n",
     "The HI data cube we downloaded is bigger than we actually need it to be.  Let's try zooming in on just the part we need and make a new sub_cube. \n",
     "\n",
@@ -560,7 +560,7 @@
     "collapsed": true
    },
    "source": [
-    "# Find and Download a Herschel Image\n",
+    "## Find and Download a Herschel Image\n",
     "\n",
     "This is great, but we want to compare the HI emission data with Herschel 350 micron emission to trace some dust. This can be done easily with [astroquery](http://www.astropy.org/astroquery/). \n",
     "We can query for the data by mission, take a quick look at the table of results, and download data after selecting a specific wavelength or filter. \n",