diff --git a/docs/pyerrors/fits.html b/docs/pyerrors/fits.html
index 4380c5a7..3bee628d 100644
--- a/docs/pyerrors/fits.html
+++ b/docs/pyerrors/fits.html
@@ -120,7 +120,7 @@
 <span class="kn">import</span> <span class="nn">iminuit</span>
 <span class="kn">from</span> <span class="nn">autograd</span> <span class="kn">import</span> <span class="n">jacobian</span>
 <span class="kn">from</span> <span class="nn">autograd</span> <span class="kn">import</span> <span class="n">elementwise_grad</span> <span class="k">as</span> <span class="n">egrad</span>
-<span class="kn">from</span> <span class="nn">.obs</span> <span class="kn">import</span> <span class="n">Obs</span><span class="p">,</span> <span class="n">derived_observable</span><span class="p">,</span> <span class="n">covariance</span><span class="p">,</span> <span class="n">pseudo_Obs</span>
+<span class="kn">from</span> <span class="nn">.obs</span> <span class="kn">import</span> <span class="n">Obs</span><span class="p">,</span> <span class="n">derived_observable</span><span class="p">,</span> <span class="n">covariance</span><span class="p">,</span> <span class="n">cov_Obs</span>
 
 
 <span class="k">class</span> <span class="nc">Fit_result</span><span class="p">(</span><span class="n">Sequence</span><span class="p">):</span>
@@ -462,7 +462,7 @@
             <span class="n">loc_priors</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">i_prior</span><span class="p">)</span>
         <span class="k">else</span><span class="p">:</span>
             <span class="n">loc_val</span><span class="p">,</span> <span class="n">loc_dval</span> <span class="o">=</span> <span class="n">extract_val_and_dval</span><span class="p">(</span><span class="n">i_prior</span><span class="p">)</span>
-            <span class="n">loc_priors</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">pseudo_Obs</span><span class="p">(</span><span class="n">loc_val</span><span class="p">,</span> <span class="n">loc_dval</span><span class="p">,</span> <span class="s1">&#39;p&#39;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">i_n</span><span class="p">)))</span>
+            <span class="n">loc_priors</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">cov_Obs</span><span class="p">(</span><span class="n">loc_val</span><span class="p">,</span> <span class="n">loc_dval</span> <span class="o">**</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;#prior&#39;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">i_n</span><span class="p">)</span> <span class="o">+</span> <span class="sa">f</span><span class="s2">&quot;_</span><span class="si">{</span><span class="n">np</span><span class="o">.</span><span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">2147483647</span><span class="p">)</span><span class="si">:</span><span class="s2">010d</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">))</span>
 
     <span class="n">output</span><span class="o">.</span><span class="n">priors</span> <span class="o">=</span> <span class="n">loc_priors</span>