Table 5: X-ray flux measurements of Praesepe and Hyades stars. All of them but one refer to the ROSAT detection in the band 0.1-2.0 keV. KW 326 was not detected by ROSAT. Its measurement, which refers to the same band, has been performed with XMM-Newton satellite.
STAR $L_{\rm X}$
  [1028 erg/s]

PRAESEPE

KW 49

 non det.
KW 100 6
KW 326 3.20
KW 368 34
KW 392 10
KW 418 non det.

HYADES
van Bueren 1 3.7
van Bueren 2 15.1
van Bueren 10 5.8
van Bueren 15 12.9
van Bueren 17 11.6
van Bueren 18 15.4
van Bueren 31 11.6
van Bueren 49 7.0
van Bueren 52 10.8
van Bueren 65 10.7
van Bueren 66 17.1
van Bueren 73 11.2
van Bueren 88 -
van Bueren 97 7.7
van Bueren 118 5.3


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