Index: /trunk/MagicSoft/TDAS-Extractor/Calibration.tex
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--- /trunk/MagicSoft/TDAS-Extractor/Calibration.tex	(revision 6629)
+++ /trunk/MagicSoft/TDAS-Extractor/Calibration.tex	(revision 6630)
@@ -803,14 +803,18 @@
 
 \begin{enumerate}
-\item Intrinsic transit time spread TTS of the PMT. It can be in the order 
+\item The intrinsic arrival time spread of the photons on the PMT. This time spread 
+can be estimated roughly by the intrinsic width of the calibration pulses of about 2\,ns 
+for the faster UV pulses and 3--4\,ns for the green and blue pulses. It amounts to 
+
+For our 
+calibration LEDs this can be up to about 2 ns, for muons it is about a 
+few hundreds of ps and for hadrons a few ns. The error of the mean 
+arrival time of the total pulse is again the arrival time spread of the 
+photons divided by the number of photo electrons.
+\item The intrinsic transit time spread TTS of the PMT. It can be in the order 
 of a few hundreds of ps per single photo electron. When we reconstruct 
 the mean pulse arrival time the error of the mean is given by the time 
 spread per single photo electron dividid by the square root of number of 
 photo electrons.
-\item Intrinsic arrival time spread of the photons on the PMT. For our 
-calibration LEDs this can be up to about 2 ns, for muons it is about a 
-few hundreds of ps and for hadrons a few ns. The error of the mean 
-arrival time of the total pulse is again the arrival time spread of the 
-photons divided by the number of photo electrons.
 \item reconstruction error due to noise and error of the numeric fit in 
 case of the digital filter. In case of the digital filter the error for