Index: trunk/MagicSoft/TDAS-Extractor/Criteria.tex
===================================================================
--- trunk/MagicSoft/TDAS-Extractor/Criteria.tex	(revision 6582)
+++ trunk/MagicSoft/TDAS-Extractor/Criteria.tex	(revision 6583)
@@ -16,5 +16,5 @@
 such. If the background resolution is bad, the signal threshold goes up and vice versa.
 
-Also an accurate determination of the signal arrival time may help to distinguish between signal and background. The signal arrival times vary smoothly from pixel to pixel while the background noise is randomly distributed in time.
+Also an accurate determination of the signal arrival time may help to distinguish between signal and background. The signal arrival times vary smoothly from pixel to pixel while the background noise is randomly distributed in time. Therefore it must be insured that the reconstructed arrival time corresponds to the same reconstructed pulse as the reconstructed charge.
 
 \par
@@ -76,4 +76,5 @@
 observed sources. 
 
+
 \subsection{Low Gain Extraction}
 
@@ -90,12 +91,16 @@
 pulses are due to the large signals with a big impact on the image parameters, especially the size parameter.
 
+
 \subsection{Stability}
 
+The signal extraction algorithms has to stabelly reconstruct the charge for different types of pules with different intrinsic shapes and backgrounds:
 
+\begin{itemize}
+\item{cosmics signals from gammas, hadrons and muons}
+\item{calibration pulses from different LED color pulsers}
+\item{pulse generator pulses in the pulpo setup}
+\end{itemize}
 
-
-
-\subsection{Treatment of Calibration Pulses}
-
+An important point is the difference between the pulse shapes of the calibration and Cherenkov signals. It has to be ensured that the calibration factor between the reconstructed charge in FADC counts and photo electrons for calibration events can be applied to Cherenkov signals.
 
 
@@ -106,13 +111,18 @@
 
 
-\ldots {\textit Some comments by Hendrik ...}
+\subsection{CPU Requirements}
 
-\subsection{CPU Requirements}
-\ldots {\textit The needed CPU time for each extractor}
+Depending on the reconstruction algorithm the signal reconstruction can take a significant amount of CPU time. Especially the more  sophisticated signal extractors which search for the position of the Cherenkov signals in the recorded FADC time slices and perform a fit to these samples can be time consuming.
+
+Thus for an online-analysis a different extraction algorithm might be chosen than for the final most accurate reconstruction of the signals offline.
 
 
 
 
+\subsection{Treatment of Calibration Pulses}
+
+
 \subsection{Pulpo Pulses}
+
 \subsection{Cosmics Data?}
 The results of this subsection are based on the following runs taken