Index: /trunk/ICRC_01/mccontrib.tex
===================================================================
--- /trunk/ICRC_01/mccontrib.tex	(revision 820)
+++ /trunk/ICRC_01/mccontrib.tex	(revision 821)
@@ -374,11 +374,22 @@
 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 
+The numbers quoted in this section are calcuated for a zenith angle
+$\Theta = 10^o$. Same studies have been done for $\Theta =0^o$ and 
+for $\Theta = 15^o$ and we got similar results. 
+We estimated the rate for the first level trigger
+with the "standard" trigger conditions.  
+The first level trigger rate due to proton showers without any
+background is $143 \pm 11~\mathrm{Hz}$. 
+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.
+to He. 
+
+However, to get a more reliable rate one must take into account 
+a realistic background situation. We take for the diffuse part of the
+night sky background a value of 0.09 photo electrons per ns
+\citep{ml94} 
+and use the star field around the Crab nebula.
+Under this more realistic conditions the first level trigger
+background rate (protons and light of night sky) is $396 \pm 88$ Hz. 
 
 It has been also studied the effect on the trigger rate of the discriminator 
@@ -396,8 +407,4 @@
 \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}
@@ -420,5 +427,5 @@
 MAGIC Collaboration, "The MAGIC Telescope, Design Study for
 the Construction of a 17m Cherenkov Telescope for Gamma 
-Astronomy Above 10 GeV", Preprint MPI-PhE?18-5, March 1998.
+Astronomy Above 10 GeV", Preprint MPI-PhE 18-5, March 1998.
 
 \bibitem[Heck and Knapp(1995)]{hk95}
@@ -427,13 +434,4 @@
 \bibitem[Mirzoyan and Lorenz(1997)]{ml97}
 Mirzoyan R. and E. Lorenz, Proc. 25th ICRC, Durban, 7, p.356, 1997
-
-
-\bibitem[Abramovitz and Stegun(1964)]{as64}
-Abramowitz, M. and Stegun, I. A., Handbook of Mathematical Functions,
-U. S. Govt. Printing Office, Washington D. C., 1964.
-
-\bibitem[Aref(1983)]{a83}
-Aref, H., Integrable, chaotic, and turbulent vortex motion in
-two-dimensional flows, Ann. Rev. Fluid Mech., 15, 345--389, 1983.
 
 \bibitem[Mirzoyan and Lorenz(1994)]{ml94}
@@ -444,2 +442,4 @@
 
 \end{document}
+
+