diff --git a/docs/pyerrors/obs.html b/docs/pyerrors/obs.html
index 47c84625..e301d6fe 100644
--- a/docs/pyerrors/obs.html
+++ b/docs/pyerrors/obs.html
@@ -485,7 +485,7 @@
 </span><span id="L-278"><a href="#L-278"><span class="linenos"> 278</span></a>
 </span><span id="L-279"><a href="#L-279"><span class="linenos"> 279</span></a>            <span class="k">def</span> <span class="nf">_compute_drho</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
 </span><span id="L-280"><a href="#L-280"><span class="linenos"> 280</span></a>                <span class="n">tmp</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">:</span><span class="n">w_max</span><span class="p">]</span>
-</span><span id="L-281"><a href="#L-281"><span class="linenos"> 281</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="mi">2</span> <span class="o">*</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
+</span><span id="L-281"><a href="#L-281"><span class="linenos"> 281</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">i</span> <span class="o">-</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">w_max</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
 </span><span id="L-282"><a href="#L-282"><span class="linenos"> 282</span></a>                                         <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">w_max</span> <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="n">i</span><span class="p">)]])</span>
 </span><span id="L-283"><a href="#L-283"><span class="linenos"> 283</span></a>                       <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="n">w_max</span> <span class="o">-</span> <span class="n">i</span><span class="p">])</span>
 </span><span id="L-284"><a href="#L-284"><span class="linenos"> 284</span></a>                <span class="bp">self</span><span class="o">.</span><span class="n">e_drho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">tmp</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="n">e_N</span><span class="p">)</span>
@@ -2133,7 +2133,7 @@
 </span><span id="Obs-279"><a href="#Obs-279"><span class="linenos">279</span></a>
 </span><span id="Obs-280"><a href="#Obs-280"><span class="linenos">280</span></a>            <span class="k">def</span> <span class="nf">_compute_drho</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
 </span><span id="Obs-281"><a href="#Obs-281"><span class="linenos">281</span></a>                <span class="n">tmp</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">:</span><span class="n">w_max</span><span class="p">]</span>
-</span><span id="Obs-282"><a href="#Obs-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="mi">2</span> <span class="o">*</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
+</span><span id="Obs-282"><a href="#Obs-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">i</span> <span class="o">-</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">w_max</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
 </span><span id="Obs-283"><a href="#Obs-283"><span class="linenos">283</span></a>                                         <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">w_max</span> <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="n">i</span><span class="p">)]])</span>
 </span><span id="Obs-284"><a href="#Obs-284"><span class="linenos">284</span></a>                       <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="n">w_max</span> <span class="o">-</span> <span class="n">i</span><span class="p">])</span>
 </span><span id="Obs-285"><a href="#Obs-285"><span class="linenos">285</span></a>                <span class="bp">self</span><span class="o">.</span><span class="n">e_drho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">tmp</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="n">e_N</span><span class="p">)</span>
@@ -2981,7 +2981,7 @@ list of ranges or lists on which the samples are defined</li>
 </span><span id="Obs.gamma_method-279"><a href="#Obs.gamma_method-279"><span class="linenos">279</span></a>
 </span><span id="Obs.gamma_method-280"><a href="#Obs.gamma_method-280"><span class="linenos">280</span></a>            <span class="k">def</span> <span class="nf">_compute_drho</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
 </span><span id="Obs.gamma_method-281"><a href="#Obs.gamma_method-281"><span class="linenos">281</span></a>                <span class="n">tmp</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">:</span><span class="n">w_max</span><span class="p">]</span>
-</span><span id="Obs.gamma_method-282"><a href="#Obs.gamma_method-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="mi">2</span> <span class="o">*</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
+</span><span id="Obs.gamma_method-282"><a href="#Obs.gamma_method-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">i</span> <span class="o">-</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">w_max</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
 </span><span id="Obs.gamma_method-283"><a href="#Obs.gamma_method-283"><span class="linenos">283</span></a>                                         <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">w_max</span> <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="n">i</span><span class="p">)]])</span>
 </span><span id="Obs.gamma_method-284"><a href="#Obs.gamma_method-284"><span class="linenos">284</span></a>                       <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="n">w_max</span> <span class="o">-</span> <span class="n">i</span><span class="p">])</span>
 </span><span id="Obs.gamma_method-285"><a href="#Obs.gamma_method-285"><span class="linenos">285</span></a>                <span class="bp">self</span><span class="o">.</span><span class="n">e_drho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">tmp</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="n">e_N</span><span class="p">)</span>
@@ -3184,7 +3184,7 @@ of the autocorrelation function (default True)</li>
 </span><span id="Obs.gm-279"><a href="#Obs.gm-279"><span class="linenos">279</span></a>
 </span><span id="Obs.gm-280"><a href="#Obs.gm-280"><span class="linenos">280</span></a>            <span class="k">def</span> <span class="nf">_compute_drho</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
 </span><span id="Obs.gm-281"><a href="#Obs.gm-281"><span class="linenos">281</span></a>                <span class="n">tmp</span> <span class="o">=</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">:</span><span class="n">w_max</span><span class="p">]</span>
-</span><span id="Obs.gm-282"><a href="#Obs.gm-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="mi">2</span> <span class="o">*</span> <span class="p">(</span><span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
+</span><span id="Obs.gm-282"><a href="#Obs.gm-282"><span class="linenos">282</span></a>                       <span class="o">+</span> <span class="n">np</span><span class="o">.</span><span class="n">concatenate</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">:</span><span class="kc">None</span> <span class="k">if</span> <span class="n">i</span> <span class="o">-</span> <span class="n">w_max</span> <span class="o">//</span> <span class="mi">2</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="k">else</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">i</span> <span class="o">-</span> <span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">w_max</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span><span class="p">):</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span>
 </span><span id="Obs.gm-283"><a href="#Obs.gm-283"><span class="linenos">283</span></a>                                         <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">w_max</span> <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="n">i</span><span class="p">)]])</span>
 </span><span id="Obs.gm-284"><a href="#Obs.gm-284"><span class="linenos">284</span></a>                       <span class="o">-</span> <span class="mi">2</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">e_rho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="mi">1</span><span class="p">:</span><span class="n">w_max</span> <span class="o">-</span> <span class="n">i</span><span class="p">])</span>
 </span><span id="Obs.gm-285"><a href="#Obs.gm-285"><span class="linenos">285</span></a>                <span class="bp">self</span><span class="o">.</span><span class="n">e_drho</span><span class="p">[</span><span class="n">e_name</span><span class="p">][</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">sum</span><span class="p">(</span><span class="n">tmp</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="n">e_N</span><span class="p">)</span>