More notebooks (#196)

* feedback on notebook 1 from andrina

* started 4th notebook on catalogs

* finished catalog notebook, generalised is_compatible

doc/3Covariances.html

@@ -7552,7 +7552,7 @@ <h1 id="Table-of-contents">Table of contents<a class="anchor-link" href="#Table-
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-<h2 id="3.1-Gaussian-covariance-of-scalar-fields-">3.1 Gaussian covariance of scalar fields <a class="anchor" id="Ss3.1"></a><a class="anchor-link" href="#3.1-Gaussian-covariance-of-scalar-fields-">¶</a></h2><p>The code below generates Gaussian realisations of a power spectrum of the form $C_\ell = 1/(\ell+10)**4$ in the presence of a reasonably complicated sky mask (that used in the analysis of the Quaia sample -- <a href="https://arxiv.org/abs/2306.17748">Alonso et al. 2023</a>). Note that we choose a relatively steep spectrum in order to highlight the usefulness of the improved NKA (iNKA) described in N20.</p>
+<h2 id="3.1-Gaussian-covariance-of-scalar-fields-">3.1 Gaussian covariance of scalar fields <a class="anchor" id="Ss3.1"></a><a class="anchor-link" href="#3.1-Gaussian-covariance-of-scalar-fields-">¶</a></h2><p>The code below generates Gaussian realisations of a power spectrum of the form $C_\ell = 1/(\ell+10)**4$ in the presence of a reasonably complicated sky mask (that used in the analysis of the Quaia sample -- <a href="https://arxiv.org/abs/2306.17749">Storey-Fisher et al. 2023</a>, <a href="https://arxiv.org/abs/2306.17748">Alonso et al. 2023</a>). Note that we choose a relatively steep spectrum in order to highlight the usefulness of the improved NKA (iNKA) described in N20.</p>
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doc/3Covariances.ipynb

@@ -63,7 +63,7 @@
    "metadata": {},
    "source": [
     "## 3.1 Gaussian covariance of scalar fields <a class=\"anchor\" id=\"Ss3.1\"></a>\n",
-    "The code below generates Gaussian realisations of a power spectrum of the form $C_\\ell = 1/(\\ell+10)**4$ in the presence of a reasonably complicated sky mask (that used in the analysis of the Quaia sample -- [Alonso et al. 2023](https://arxiv.org/abs/2306.17748)). Note that we choose a relatively steep spectrum in order to highlight the usefulness of the improved NKA (iNKA) described in N20."
+    "The code below generates Gaussian realisations of a power spectrum of the form $C_\\ell = 1/(\\ell+10)**4$ in the presence of a reasonably complicated sky mask (that used in the analysis of the Quaia sample -- [Storey-Fisher et al. 2023](https://arxiv.org/abs/2306.17749), [Alonso et al. 2023](https://arxiv.org/abs/2306.17748)). Note that we choose a relatively steep spectrum in order to highlight the usefulness of the improved NKA (iNKA) described in N20."
    ]
   },
   {