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{\bf Table 2: Optical properties of X--ray detected Praesepe candidates}

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\footnotesize
\begin{tabular}{llllllllll} \hline
 & & & & & & & & & \\		
X-ray N&Opt. ID &$\alpha$ (J2000)& $\delta$ (J2000)& V&$B - V$&$V - I$&p&Sp.&notes \\
 & & & & & & & & &   \\ \hline
 & & & & & & & & &   \\	
1  &KW 16  & 8~37~02.10 & +19~36~16.7 & 9.25&0.47& -- &99&F6    &vsini=35,40 km/s   \\
2  &KW 31  & 8~37~28.03 & +19~33~45.3 & 9.79&0.57& -- &98&F6 V  &PhB
   \\
3  &KW 34  & 8~37~28.22 & +19~09~44.2 & 9.50&0.43& -- &96&F6    & 
   \\
4  &KW 40  & 8~37~37.06 & +19~43~58.8 & 7.84&0.21& -- &99&Am    &vsini=20,60 km/s   \\
5  &KW 55  & 8~37~50.04 & +19~53~29.0 &11.41&0.84& -- &98&      &
    \\
6  &KW 100 & 8~38~24.32 & +20~06~21.1 &10.55&0.58& -- &96&G1 V  &
    \\
7  &KW 142 & 8~39~02.89 & +19~43~28.9 & 9.31&0.49& -- &77&F7 V  &SB2, vsini=20:     \\
8  &KW 181 & 8~39~25.05 & +19~27~33.6 &10.47&0.59& -- &99&G0 V  &SB1 
    \\
9  &KW 182 & 8~39~30.51 & +20~04~08.4 &10.32&0.68& -- &97&F8 V  &PhB 
    \\
10 &KW 184 & 8~39~28.61 & +19~28~24.5 &11.68&0.90& -- &93&      &SB2
    \\
11 &KW 212 & 8~39~50.76 & +19~32~27.2 & 6.59&0.96& -- &--&K0 III&vsini$<$45 km/s    \\
12 &KW 213 & 8~39~50.86 & +19~33~01.2 &11.84&0.77& -- &--&      &
    \\
13 &KW 217 & 8~39~52.42 & +19~18~45.1 &10.23&0.51& -- &99&      &
    \\
14 &KW 222 & 8~39~55.12 & +20~03~54.0 &10.11&0.49& -- &--&F4 V  &   
    \\
15 &KW 224 & 8~39~56.54 & +19~33~10.9 & 7.32&0.19& -- &--&Am    &SB2, vsini=60 km/s \\
16 &KW 229 & 8~39~57.82 & +19~32~28.8 & 7.54&0.25& -- &--&Am    &SB2, vsini=120 km/s\\
17 &KW 236 & 8~39~59.85 & +19~33~59.3 &11.94&1.00& -- &--&      & 
    \\
18 &KW 237 & 8~40~00.03 & +19~34~40.3 &12.88&0.99& -- &95&      &
    \\
19 &KW 238 & 8~40~00.71 & +19~48~22.7 &10.30&0.51& -- &98&      &SB? 
    \\
20 &KW 239 & 8~40~01.34 & +20~08~07.6 & 9.67&0.44& -- &99&F6 V  &vsini=30 km/s      \\
21 &KW 244 & 8~40~01.79 & +18~59~58.6 & 9.98&0.62& -- &99&G1 V  &SB2 
    \\
22 &KW 256 & 8~40~05.71 & +19~01~30.4 &12.62&1.00& -- &57&      &
    \\
23 &KW 263 & 8~40~09.71 & +19~37~17.1 &12.02&0.81& -- &99&K0 V  &
    \\
24 &KW 267 & 8~40~13.47 & +19~46~42.9 &13.19&1.11& -- &97&      &
    \\
25 &KW 275 & 8~40~17.69 & +19~47~15.7 & 9.96&0.58& -- &99&G1 V  &PhB, vsini$<20$km/s\\
26 &KW 282 & 8~40~22.36 & +20~06~23.4 &10.08&0.51& -- &--&      &
    \\
27 &KW 288 & 8~40~22.79 & +19~27~53.4 &10.69&0.59& -- &99&G0 V  &
    \\
28 &KW 292 & 8~40~26.80 & +20~10~55.2 & 8.18&0.30& -- &--&A9 V  &SB2, vsini=160 km/s\\
29 &KW 293 & 8~40~25.55 & +19~28~32.3 & 9.89&0.48& -- &99&      &
    \\
30 &KW 322 & 8~40~39.93 & +19~40~08.4 &10.87&0.68& -- &1 &G2 V  &SB 
    \\
31 &KW 323 & 8~40~39.29 & +19~13~42.5 & 7.80&0.22& -- &99&A8 V  &vsini=130 km/s     \\
32 &KW 325 & 8~40~41.98 & +19~13~25.3 &10.61&0.61& -- &98&G1 V  &SB 
    \\
33 &KW 334 & 8~40~48.01 & +19~39~32.0 &11.02&0.71& -- &96&G5 V  &
    \\
34 &KW 367 & 8~41~09.64 & +19~51~17.8 &10.71&0.68& -- &98&      &SB3 
    \\
35 &KW 368 & 8~41~10.35 & +19~49~06.7 &11.52&0.72& -- &98&      &SB1 
    \\
36 &KW 370 & 8~41~10.75 & +19~49~45.7 & 9.04&0.36& -- &95&F3 V  &vsini$<45$,140 km/s\\
37 &KW 371 & 8~41~10.02 & +19~30~31.7 &10.21&0.50& -- &99&F8 V  &
    \\
38 &KW 392 & 8~41~25.85 & +19~56~35.9 &10.72&0.60& -- &98&G0 V  &     
    \\
39 &KW 401 & 8~41~30.77 & +18~52~18.6 &12.97&1.00& -- &95&      &
    \\
40 &KW 417 & 8~41~43.75 & +19~57~42.9 &12.35&0.88& -- &98&      &
    \\
41 &KW 428 & 8~41~50.14 & +19~52~26.5 & 6.90&0.96& -- &--&K0 III&SB1, vsini$<45$km/s\\
42 &KW 434 & 8~41~54.43 & +19~15~26.3 &11.41&0.73& -- &96&G5 V  &SB1 
    \\
43 &KW 458 & 8~42~20.19 & +20~02~10.9 & 9.71&0.55& -- &92&      &vsini=20 km/s      \\
44 &KW 495 & 8~43~06.03 & +19~26~15.3 & 9.97&0.66& -- &99&      &SB3 
    \\
45 &KW 496 & 8~43~07.06 & +19~04~06.2 & 9.57&0.51& -- &98&F8    &SB2, vsini=30 km/s \\
46 &KW 570 & 8~39~41.12 & +19~59~28.8 &15.29&1.49&1.80&98&      &
    \\
47 &JC 10  & 8~32~39.52 & +19~07~22.8 &12.34&0.66& -- &95&      &phot. non member   \\
48 &JC 80  & 8~36~56.35 & +18~57~48.0 &14.97&1.59&2.00&49&     &
    \\
49 &JC 124 & 8~38~27.77 & +19~45~55.8 &15.87&1.58&2.07&97&     &
   \\
50 &JC 126 & 8~38~32.88 & +19~46~25.6 &16.26&1.47&2.20&80&     &
   \\
 & & & & & & & & & \\ \hline
\end{tabular}
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{\bf Table 2: continued}

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\footnotesize
\begin{tabular}{llllllllll} \hline
 & & & & & & & & & \\		
X-ray N&Opt. ID &$\alpha$ (J2000)& $\delta$ (J2000)& V&$B - V$&$V - I$&p&Sp.&notes  \\
 & & & & & & & & &  \\ \hline
 & & & & & & & & &  \\	
51 &JC 143 & 8~39~03.00 & +19~31~57.9 &16.92&1.57& -- &88&     &
    \\
52 &JC 151 & 8~39~11.02 & +18~10~33.4 &10.25&0.56& -- &58&     &
    \\
53 &JC 241 & 8~41~11.35 & +19~31~46.7 &16.57&1.44&2.53&90&     &
    \\
54 &JC 243 & 8~41~13.26 & +19~32~34.6 &14.09&1.42&1.66&97&     &
    \\
55 &JS 39  & 8~33~33.12 & +18~08~26.6 &16.25& -- &1.93&44&     &
    \\
56 &JS 236 & 8~38~30.71 & +18~07~18.7 &15.70& -- &2.30&79&     &
    \\
57 &JS 313 & 8~39~45.25 & +20~07~27.5 &17.49& -- &2.92&98&     &
    \\
58 &JS 344 & 8~40~10.84 & +18~58~56.2 &16.72& -- &2.43&92&     &
    \\
59 &JS 379 & 8~40~44.34 & +20~28~18.2 &13.93& -- &1.63&96&     &
    \\
60 &JS 384 & 8~40~46.94 & +20~28~29.1 &16.09& -- &2.34&89&     &
    \\
61 &JS 392 & 8~40~53.95 & +19~59~55.7 &16.77& -- &2.62&82&     &
    \\
62 &JS 430 & 8~41~24.54 & +20~07~49.0 &16.46& -- &2.41&91&     &
    \\
63 &JS 434 & 8~41~28.88 & +19~58~31.7 &16.80& -- &2.50&82&     &
    \\
64 &JS 506 & 8~42~52.27 & +19~51~46.1 &16.99& -- &2.49&54&     &
    \\
65 &JS 526 & 8~43~15.35 & +20~03~55.8 &13.58&1.15& - -&97&     &
    \\
66 &JS 689 & 8~36~14.36 & +19~25~30.5 &16.77& -- &2.60&{\it pos.}&&
    \\
67 &JS 729 & 8~41~25.99 & +19~59~13.9 &18.23& -- &2.75&{\it pos.}&&
    \\
68 &JS 733 & 8~41~36.67 & +20~34~05.3 &18.43& -- &2.69&{\it pos.}&&
    \\
 & & & & & & & & & \\ \hline
\end{tabular}
\end{center}
KW: Klein-Wassink (1927); JC: Jones \& Cudworth (1983); JS: Jones \&
Stauffer (1991). \\
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