diff --git a/sc_elements.py b/sc_elements.py
index b99d613..1a39fdc 100755
--- a/sc_elements.py
+++ b/sc_elements.py
@@ -70,3 +70,17 @@ fig.savefig('/home/kvkempen/Documents/20212022Q3/Superconductivity/assignments/s
 #fig.savefig('/home/kvkempen/Documents/20212022Q3/Superconductivity/assignments/sc_elements.pdf')
 
 plt.close(fig)
+
+##
+
+print(df.corr())
+
+##
+
+# Now we split the data into groups.
+elgr1 = ['Nb', 'Tc', 'Pb', 'V', 'Ta', 'Sn', 'In', 'Tl', 'Pa', 'Ga', 'Th', 'Re', 'Al', 'Mn', 'Mo', 'Zn', 'Be', 'Rn', 'Cd']
+elgr2 = ['W', 'Li', 'Ru', 'U', 'Hf', 'Ti', 'Zr', 'Lu', 'Am', 'Hg', 'La']
+
+gr1 = df[df['element'].isin(elgr1)]
+gr2 = df[df['element'].isin(elgr2)]
+print(gr1.corr(), '\n', gr2.corr())
diff --git a/superconductivity_assignment1_kvkempen.tex b/superconductivity_assignment1_kvkempen.tex
index 449e39d..9172137 100755
--- a/superconductivity_assignment1_kvkempen.tex
+++ b/superconductivity_assignment1_kvkempen.tex
@@ -56,7 +56,7 @@
 \begin{document}
 
 \section{Electron-phonon coupling in elements}
-Conventional superconductors (sc) are described by considering Cooper pairs:
+Conventional superconductors are described by considering Cooper pairs:
 pairs of electrons mediated by electron-phonon coupling.
 This is usually described by BCS theory.
 The hypothesis is that stronger electron-phonon coupling results in enhanced critical temperatures for the superconducting phase transition.
@@ -92,6 +92,20 @@ If $|r| = 1$, there is a perfectly linear relation.
 The lower $|r|$ is, the less correlated the points are.
 The sign of $r$ gives the direction of the trend.
 This slightly positive value found for the superconducting elements suggests a slightly positive but uncertain correlation.
+As the relation between electron-phonon coupling and resistivity is well-established, it seems reasonable to conclude that there is no unambiguous relation between $T_c$ and $\rho_{300K}$.
+There seem to be other factors we are missing in this analysis.
+
+Looking at the plot, however, it would be too easy to conclude there is no relation between these quantities at all.
+There do seem to be two branches with approximate linear correlation.
+Distinguishing these two groups roughly along the line from the origin under Re, we find $r = 0.69739$ and $r = 0.621341$ respectively above and below the line.
+
+Another missing factor is the comparison to non-superconductor elemental metals.
+Although they do not really experience a phase transition to a superconducting state, so they do not have a finite $T_c$ associated to them, they could be plotted having $T_c = 0$.
+I chose to exclude them from the plot, as they would only clutter it further, and there is no real relation visible.
+
+Further distinction could be in superconductor type.
+Most of the plotted elements are type-I superconductors, but vanadium, for example, is type-II.
+Vanadium does, however, behave similar to the rest of the elements.
 
 \section{Exam question electrodynamics in superconductors}
 No idea yet.