[projects] little updates

projects/project_noiseficurves/noiseficurves.tex

@@ -63,8 +63,8 @@ spikes = lifspikes(trials, current, tmax, Dnoise);
     of this neuron?
 
     \part Compute the $f$-$I$ curves of neurons with various noise
-    strengths \texttt{Dnoise}. Use for example $D_{noise} = 1e-3$,
-    $1e-2$, and $1e-1$.
+    strengths \texttt{Dnoise}. Use for example $D_{noise} = 10^{-3}$,
+    $10^{-2}$, and $10^{-1}$.
 
     How does the intrinsic noise influence the response curve?
 
@@ -76,6 +76,8 @@ spikes = lifspikes(trials, current, tmax, Dnoise);
     responses of the four different neurons to the same input, or by
     the same resulting mean firing rate.
 
+    How do the responses differ?
+
     \part Let's now use as an input to the neuron a 1\,s long sine
     wave $I(t) = I_0 + A \sin(2\pi f t)$ with offset current $I_0$,
     amplitude $A$, and frequency $f$. Set $I_0=5$, $A=4$, and