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{\bf Table 2.} Results of the O-C analysis. Sources for the times of maxima: 
1)~Kiss et al. (1999), 2)~present work.

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%table 2
\normalsize
\begin{tabular}{clrrc}  \hline
i & ~~T$_i$(HJD) & E$_i$~~~ & (O--C) & Source\\
~&2400000.+ & (cycles) & (days)~ & ~\\ \hline
 1  &51032.3936       &-2322     &  0.0041 &1\\
 2  &51037.4134       &-2295     &  0.0001 &1\\
 3  &51080.3928       &-2064     & -0.0015 &1\\
 4  &51110.3465       &-1903     & -0.0043 &1\\
 5  &51464.4364       &    0     &  0.0035 &2\\
 6  &51490.2981       &  139     &  0.0021 &2\\
 7  &51752.4565       & 1548     & -0.0053 &2\\
 8  &51753.3981       & 1553     &  0.0059 &2\\
 9  &51755.4384       & 1564     & -0.0005 &2\\
10  &51810.6989       & 1861     & -0.0014 &2\\
11  &51812.7500       & 1872     &  0.0030 &2\\
12  &51813.6727       & 1877     & -0.0046 &2\\
13  &51815.7169       & 1888     & -0.0071 &2\\
14  &51981.6955       & 2780     &  0.0013 &2\\
15  &51982.6292       & 2785     &  0.0047 &2\\ 
\hline
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{\bf Table 5.} Results from the Fourier analysis applied to the data collected 
by Kiss et al. (1999) and the Hipparcos satellite (ESA 1997). The 
corresponding T$_{or}$ are: 2451032.$^d$3149 for the 1998 {\em vby} data, 
2451087.$^d$2514 for the 1998 BV data and 2447862.$^d$0393 for the Hipparcos 
H$_p$ data

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%table 5
\small
\begin{tabular}{lrrrrrrrrrrrr}  \hline
~ & \multicolumn{2}{c}{{\em ~~~~v}} & \multicolumn{2}{c}{{\em b}} &
\multicolumn{2}{c}{{\em y}} & \multicolumn{2}{c}{{\em B}} 
& \multicolumn{2}{c}{{\em V}} & \multicolumn{2}{c}{{\em H$_p$}}\\ \hline 
Frequency & A~~~ & $\varphi$~~ &A~~~ & $\varphi$~~ &
A~~~ & $\varphi$~~ &A~~~ & $\varphi$~~ 
&A~~~ & $\varphi$~~ &A~~~ & $\varphi$~~ \\
~~~(cd$^{-1}$)& (mmag) & (rad) &(mmag) & (rad) &
(mmag) & (rad) &(mmag) & (rad) 
&(mmag) & (rad)&(mmag) & (rad) \\ \hline
~ & $\pm$1.51 &~& $\pm$1.39 &~& $\pm$0.92 &~& $\pm$1.49 
&~&$\pm$2.47 &~&$\pm$1.72 &~\\
f$_1$=5.3745   &119.07 &2.022 &96.09 &2.003 &79.97 &2.009 &114.40 &3.623 &
80.23 &3.582 &86.33 &5.381 \\
~              &~      &   13 &~     &   15 &~      &  12 &~     &    13 &
~     &   31 &~     &   20 \\
2f$_1$=10.7490 & 12.51 &0.618 &10.89 &0.572 & 9.59 &0.283 & 20.29 & 4.290&
17.38 &4.182 &10.49 &0.683 \\
~              &~      &  122 &~     &  129 &~      &  96 &~     &    72 &
~     &  139 &~     &  165 \\
~&~&~&~&~&~&~&~&~&~&~&~&~\\
mean value & 8.1119 & ~ & 7.7439 & ~ & 7.4922 & ~ & 7.8481& ~ & 7.4987& ~ &
 7.5828& ~ \\
(mag)      &  11 & ~ & 10 & ~ &  7 & ~ & 10 & ~ & 17 & ~ & 12 & ~ \\
residuals & 16.5 & ~ & 15.2 & ~ & 10.0 & ~ & 11.8 & ~ & 19.6 & ~ & 13.6 & ~ \\
(mmag)&~&~&~&~&~&~&~&~&~&~&~&~\\
\hline
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{\bf Table 7.} Photometry (normal points) of V2109~Cyg

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%table 7
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\begin{tabular}{cccccc}  \hline
Phase & V & b-y & m$_{1}$ & c$_{1}$ & $\beta$ \\ \hline
0.00  &7.408 &0.205 &0.171 &0.890 &2.760\\
0.05  &7.410 &0.205 &0.171 &0.890 &2.758\\
0.10  &7.421 &0.209 &0.171 &0.884 &2.756\\
0.15  &7.438 &0.214 &0.171 &0.874 &2.752\\
0.20  &7.461 &0.220 &0.171 &0.862 &2.745\\
0.25  &7.484 &0.226 &0.171 &0.847 &2.740\\
0.30  &7.504 &0.231 &0.171 &0.833 &2.736\\
0.35  &7.523 &0.237 &0.172 &0.821 &2.732\\
0.40  &7.540 &0.241 &0.172 &0.811 &2.727\\
0.45  &7.554 &0.243 &0.172 &0.802 &2.723\\
0.50  &7.564 &0.245 &0.173 &0.794 &2.722\\
0.55  &7.570 &0.245 &0.173 &0.792 &2.722\\
0.60  &7.571 &0.244 &0.172 &0.795 &2.725\\
0.65  &7.563 &0.241 &0.172 &0.799 &2.728\\
0.70  &7.545 &0.237 &0.172 &0.806 &2.733\\
0.75  &7.521 &0.231 &0.172 &0.818 &2.738\\
0.80  &7.492 &0.223 &0.171 &0.834 &2.743\\
0.85  &7.461 &0.216 &0.171 &0.854 &2.749\\
0.90  &7.434 &0.210 &0.171 &0.872 &2.755\\
0.95  &7.416 &0.206 &0.171 &0.884 &2.759\\ 
\hline
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