Table 5: Variability on longer time scale: here we use multiple ROSAT observations of dF7-dK2 Pleiades stars separed by at least 0.5 months.
Name <L_x> $\frac{\Delta L}{\delta L}$ Elapsed time Time

range on medium-time of each obs. between obs.

[erg/s] scale [hours] [months]

HII-253 29.87-30.11 4.44 1.16-3.62 12

HII-708 29.63-28.82 6.02 1.18-4.51 12

HII-727 29.75-29.83 <2 1.35-4.14 12

HII-738 29.58-29.70 <2 1.29-6.54 12

HII-761 29.62-29.73 <2 5.09-5.15 0.5

HII-1032 29.96-29.99 <2 1.48-4.91 12

HII-1124 29.29-29.30 <2 1.80-6.95 12

HII-1136 29.54-29.78 3.49 1.19-6.06 12

HII-1207 28.97-29.47 6.50 4.12-5.00 0.5

HII-1726 29.23-29.46 2.67 1.18-4.84 12

HII-1856 29.18-29.43 3.63 2.74-5.83 6

**Table 5:** Variability on longer time scale: here we use multiple ROSAT observations of dF7-dK2 Pleiades stars separed by at least 0.5 months.
Name	<L_x>	$\frac{\Delta L}{\delta L}$	Elapsed time	Time
	range	on medium-time	of each obs.	between obs.
	[erg/s]	scale	[hours]	[months]
HII-253	29.87-30.11	4.44	1.16-3.62	12
HII-708	29.63-28.82	6.02	1.18-4.51	12
HII-727	29.75-29.83	<2	1.35-4.14	12
HII-738	29.58-29.70	<2	1.29-6.54	12
HII-761	29.62-29.73	<2	5.09-5.15	0.5
HII-1032	29.96-29.99	<2	1.48-4.91	12
HII-1124	29.29-29.30	<2	1.80-6.95	12
HII-1136	29.54-29.78	3.49	1.19-6.06	12
HII-1207	28.97-29.47	6.50	4.12-5.00	0.5
HII-1726	29.23-29.46	2.67	1.18-4.84	12
HII-1856	29.18-29.43	3.63	2.74-5.83	6

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