diff --git a/docs/.buildinfo b/docs/.buildinfo
index a0fff47..ed96cec 100644
--- a/docs/.buildinfo
+++ b/docs/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: ae4009e095794a40f5cc745559adf3bd
+config: 81c54022bf6dffd6e48b7cad4e5c9822
 tags: 645f666f9bcd5a90fca523b33c5a78b7
diff --git a/docs/_static/documentation_options.js b/docs/_static/documentation_options.js
index 1a8d864..3768dcc 100644
--- a/docs/_static/documentation_options.js
+++ b/docs/_static/documentation_options.js
@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '0.1.12',
+    VERSION: '0.1.13',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/docs/api/index.html b/docs/api/index.html
index afc3bb8..66471fa 100644
--- a/docs/api/index.html
+++ b/docs/api/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>API documentation &mdash; pymde 0.1.12 documentation</title>
+  <title>API documentation &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -34,7 +34,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/citing/index.html b/docs/citing/index.html
index 5a16826..f90e224 100644
--- a/docs/citing/index.html
+++ b/docs/citing/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Citing &mdash; pymde 0.1.12 documentation</title>
+  <title>Citing &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -32,7 +32,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/datasets/index.html b/docs/datasets/index.html
index 46825a5..b83f2d7 100644
--- a/docs/datasets/index.html
+++ b/docs/datasets/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Datasets &mdash; pymde 0.1.12 documentation</title>
+  <title>Datasets &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/examples/index.html b/docs/examples/index.html
index 4e2bbc2..14520dc 100644
--- a/docs/examples/index.html
+++ b/docs/examples/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Examples &mdash; pymde 0.1.12 documentation</title>
+  <title>Examples &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/genindex.html b/docs/genindex.html
index c24e586..55dc5d2 100644
--- a/docs/genindex.html
+++ b/docs/genindex.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Index &mdash; pymde 0.1.12 documentation</title>
+  <title>Index &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="_static/autoclasstoc.css" type="text/css" />
@@ -30,7 +30,7 @@
             <a href="index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
diff --git a/docs/getting_started/index.html b/docs/getting_started/index.html
index 664dd2c..e442950 100644
--- a/docs/getting_started/index.html
+++ b/docs/getting_started/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Getting started &mdash; pymde 0.1.12 documentation</title>
+  <title>Getting started &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/index.html b/docs/index.html
index 9fe2ce8..4230cb5 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>PyMDE: Minimum-Distortion Embedding &mdash; pymde 0.1.12 documentation</title>
+  <title>PyMDE: Minimum-Distortion Embedding &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="_static/autoclasstoc.css" type="text/css" />
@@ -32,7 +32,7 @@
             <a href="#" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
diff --git a/docs/installation/index.html b/docs/installation/index.html
index f22aa34..285d1b6 100644
--- a/docs/installation/index.html
+++ b/docs/installation/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Installation &mdash; pymde 0.1.12 documentation</title>
+  <title>Installation &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/mde/index.html b/docs/mde/index.html
index a8963ed..fa9f897 100644
--- a/docs/mde/index.html
+++ b/docs/mde/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>MDE &mdash; pymde 0.1.12 documentation</title>
+  <title>MDE &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -34,7 +34,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/objects.inv b/docs/objects.inv
index 5f1228c..29432b1 100644
Binary files a/docs/objects.inv and b/docs/objects.inv differ
diff --git a/docs/preprocess/index.html b/docs/preprocess/index.html
index ded09a5..9c48f41 100644
--- a/docs/preprocess/index.html
+++ b/docs/preprocess/index.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Preprocessing &mdash; pymde 0.1.12 documentation</title>
+  <title>Preprocessing &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="../_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="../index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
diff --git a/docs/py-modindex.html b/docs/py-modindex.html
index e1a614d..3189948 100644
--- a/docs/py-modindex.html
+++ b/docs/py-modindex.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Python Module Index &mdash; pymde 0.1.12 documentation</title>
+  <title>Python Module Index &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="search.html" method="get">
diff --git a/docs/search.html b/docs/search.html
index c1bc501..43932bb 100644
--- a/docs/search.html
+++ b/docs/search.html
@@ -3,7 +3,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>Search &mdash; pymde 0.1.12 documentation</title>
+  <title>Search &mdash; pymde 0.1.13 documentation</title>
       <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
       <link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
       <link rel="stylesheet" href="_static/autoclasstoc.css" type="text/css" />
@@ -33,7 +33,7 @@
             <a href="index.html" class="icon icon-home"> pymde
           </a>
               <div class="version">
-                v0.1.12
+                v0.1.13
               </div>
 <div role="search">
   <form id="rtd-search-form" class="wy-form" action="#" method="get">
diff --git a/pymde/__init__.py b/pymde/__init__.py
index e4c1111..66c8229 100644
--- a/pymde/__init__.py
+++ b/pymde/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.1.12"
+__version__ = "0.1.13"
 
 from pymde.problem import MDE