worked on rebuttal

rebuttal2.tex

@@ -121,7 +121,7 @@
 \response{In \textit{Apteronotus} T-units are characterized by 1:1
   locking to the EOD, i.e. by having a baseline firing rate matching
   the EOD frequency. We definitely have no T-units in our data
-  set. This we eplain now in the ``Identification of P-units and
+  set. This we explain now in the ``Identification of P-units and
   ampullary cells'' section in the methods.}
 
 \issue{In line 147, rather than using the term
@@ -211,8 +211,6 @@
   electrosensory systems of weakly electric fish. I have several
   suggestions for the authors.}
 
-\response{}
-
 \issue{(1) Abstract, line 29. "...if these frequencies or their sum
   match the neuron's baseline firing rate" is not quite accurate
   because "these frequencies" implies BOTH input frequencies must
@@ -244,7 +242,8 @@
   are no negative frequencies in your actual data. How can frequencies
   be negative?}
 
-\response{UH... LETS WRITE SOMETHING}
+\response{We added a few sentences following equation (1) to motivate
+  the existence of negative frequencies in Fourier transforms.}
 
 \issue{(5) Figure 3 and 4. Why are the power spectra clipped at such
   low frequencies? This makes it impossible to see peaks due to
@@ -253,7 +252,7 @@
   clipped in these two figures.}
 
 \response{You are right. In figure 4 we show now the spectrum up to
-  750\,Hz, such that $f_{EOD}§ and its interactions with $\Delta f_2$
+  750\,Hz, such that $f_{EOD}$ and its interactions with $\Delta f_2$
   and harmonics are included. We labeled the additonal peaks
   accordingly. In figure 3 we stay with the small range, because we
   have so little data for this special setting where one of the beat
@@ -288,9 +287,8 @@
 \response{No, what is shown is the power spectrum of the spike
   response, not the one of the amplitude modulation or envelope of the
   stimulus. We added a sentence to the end of the figure caption to
-  make this clear.}
-
-\response{If it were the power spectrum of the signal after it passed
+  make this clear.\\
+  If it were the power spectrum of the signal after it passed
   a non-linearity (rectification or threhsolding at zero), then there
   could be also peaks at the sum and difference of the beat
   frequencies. However, since they are close to the higher one of the
@@ -302,7 +300,8 @@
 \issue{(8) Line 302. "not-small amplitude" is arbitrary and
   vague. Please be clearer and more precise.}
 
-\response{}
+\response{We added ``resulting in AM contrasts of 10\,\% that evoke
+  strong modulations in a P-unit's firing rate response''.}
 
 \issue{(9) Figures 5C and 6C. For the stimuli with the red RAM
   waveforms, please make it clear which contrast is being represented
@@ -322,7 +321,15 @@
   contrast increases, when theory predicts that higher signal-to-noise
   ratios should result in larger nonlinearities?}
 
-\response{NOISE STIMULUS LINEARIZES. BENJI. BUt also highlight the difference between noise and sinewae stimulation in other parts of the manuscript.}
+\response{Yes, in figure 4 increasing stimulus contrast results in
+  stronger nonlinearities. There the stimuli are narrow-band sine
+  waves. However, as pointed out in the context of figure 7, when
+  using a broad-band noise stimulus instead, this stimulus by itselfs
+  adds background noise to the system that linearizes the
+  response. That is why the susceptibilities estimated from noise
+  stimuli decrease for higher stimulus contrasts.\\
+  We added a whole paragraph at the beginning of this section to make
+  this clear.}
 
 \issue{(12) Lines 655-675. This was a very nice end to the discussion,
   but I would like to see more. I would like the broader significance