Index: /trunk/ICRC_01/mccontrib.tex
===================================================================
--- /trunk/ICRC_01/mccontrib.tex	(revision 818)
+++ /trunk/ICRC_01/mccontrib.tex	(revision 819)
@@ -284,5 +284,5 @@
 This part is still in the design phase. 
 All results presented here are based on studies of the
-first-level-trigger. It not mentioned somewhere else, 
+first-level-trigger. If not mentioned somewhere else, 
 the MC data are produced with "standard"
 values (discriminator threshold = 4 mV, gate length = 6 nsec, 
@@ -372,6 +372,32 @@
 
 Using the monte carlo data sample, it is possible to estimate 
-the expected rates from 
-
+the expected rates from proton showers and background light. 
+
+The estimated trigger rate due to proton showers is $143 \pm 11$ Hz. This 
+rate would increase due to other hadron showers (He, Li, ...) which 
+we have not simulated yet. About 25 \% larger rate is expected due mainly 
+to He. Moreover, to get a realistic rate one should assume a realistic 
+background, for instance 0.09 photo electrons per ns \citep{ml94} and 
+the Crab Nebula star field. Under this conditions the estimated rate is 
+$396 \pm 88$ Hz.
+
+It has been also studied the effect on the trigger rate of the discriminator 
+threshold (see figure \ref{fig_rates}). The trigger rate decreases 
+with increasing discriminator threshold. Notice that the expected rate 
+for the discriminator value at 3 mV is more than 100 times larger than 
+for the other values.
+
+\begin{figure}[hb]
+ \vspace*{2.0mm} % just in case for shifting the figure slightly down
+ \includegraphics[width=8.3cm]{rates.eps} % .eps for Latex,
+                                            % pdfLatex allows .pdf, .jpg, .png and .tif
+ \caption{Estimated trigger rates as a function of trigger discriminator for $10^\circ$ zenith angle with 0.09 photo electrons of diffuse NSB and the Crab Nebula star field.}
+ \label{fig_rates}
+\end{figure}
+
+The numbers that appear in this section have been estimated for $10^\circ$ 
+zenith angle. But the same studies have been done for $0^\circ$ and $15^\circ$ 
+and 
+we got similar results.
 
 \section{Conclusion}
@@ -411,4 +437,8 @@
 two-dimensional flows, Ann. Rev. Fluid Mech., 15, 345--389, 1983.
 
+\bibitem[Mirzoyan and Lorenz(1994)]{ml94}
+Mirzoyan R. and E. Lorenz, Measurement of the night sky light background 
+at La Palma, Max-Planck-Institut report MPI-PhE/94-35
+
 \end{thebibliography}