diff --git a/PS2/doc.pdf b/PS2/doc.pdf
index 3997640..4ba9f82 100644
Binary files a/PS2/doc.pdf and b/PS2/doc.pdf differ
diff --git a/PS2/doc.synctex.gz b/PS2/doc.synctex.gz
index 5562864..b00bebb 100644
Binary files a/PS2/doc.synctex.gz and b/PS2/doc.synctex.gz differ
diff --git a/PS2/doc.tex b/PS2/doc.tex
index 64faed6..d003abf 100644
--- a/PS2/doc.tex
+++ b/PS2/doc.tex
@@ -680,9 +680,28 @@ axis([0 1e-9 0 0.04]);
            
             \item %4a
 
+            \begin{figure}[H]
+                \centering
+                \begin{subfigure}{0.5\textwidth}
+                    \centering
+                    \includegraphics[width=\textwidth]{q4a_e1.png}
+                    \caption{}
+                \end{subfigure}%
+                \begin{subfigure}{0.5\textwidth}
+                    \centering
+                    \includegraphics[width=\textwidth]{q.png}
+                    \caption{}
+                \end{subfigure}
+                \caption{(a),(b) Previous plots but with the classical momentum marked in red.}
+            \end{figure}
+
             % TODO I really don't like this explanation...
-            An \( a \) value of \( 0.62 \angstrom \) was chosen, in order to provide an adequately
-            shaped graph without sacrificing too much computation time.
+            An \( a \) value of \( 0.53 \angstrom \) was chosen in order to provide an adequately
+            shaped graph without sacrificing too much computation time and ensure that the first two
+            numerical energies correspond to the given experimental results. The experimental results are
+            \(\SI{0.14395}{\electronvolt}\) and \(\SI{0.43185}{\electronvolt} \) for the first and second energy levels 
+            respectively, and the numerical results with our chosen \(a\) are \(\SI{0.0.14386}{\electronvolt}\) and \(\SI{0.43140}{\electronvolt} \)
+
 
             % maybe talk about normalization?
 
@@ -692,7 +711,13 @@ axis([0 1e-9 0 0.04]);
                 \lipsum[1]
                 \item %4bii
 
-                
+                Between \( 0V \) and \( 0.25V \), only the first energy level is carrying any current.
+                This current drops to 0 above \( 0.25V\) because the coupling between the contacts and that
+                energy level drops to 0, meaning no electrons can transfer.
+
+                Between \(0.4V\) and \(0.65V\), only the second energy level is carrying current.
+                This energy level stops dropping current because it's shifted energy drops below
+                the threshold where the contacts have any coupling with it.
 
                 \item %4biii
 
diff --git a/PS2/q4a.m b/PS2/q4a.m
index 3909d57..7d9a615 100644
--- a/PS2/q4a.m
+++ b/PS2/q4a.m
@@ -18,7 +18,7 @@ w0 = (0.2879*q/hbar);
 
 % YOU MUST ENTER AN APPROPRIATE VALUE OF "a"
 
-a = 12 / sqrt(m*w0/hbar) / 100;
+a = 12 / sqrt(m*w0/hbar) / 120;
 beta = sqrt(m*w0/hbar);
 x = [-6/beta:a:6/beta];
 N = length(x);