**Table 1:** X-ray observing log and coordinates of T Tau.
Parameter	XMM-Newton	Chandra
XEST number	01-045	....
ObsID	0301500101	3732
Start time (UT)	2005-08-15 13:52:13	2003-10-24 06:11:52
End time (UT)	2005-08-16 12:55:22	2003-10-24 13:37:02
Exposure time	82989 s	26710 s
Coordinates:^a
Boresight RA	04 $^{\rm h}$ 21 $^{\rm m}$ 59.4 $^{\rm s}$	04 $^{\rm h}$ 21 $^{\rm m}$ 59.69 $^{\rm s}$
Boresight decl.	$19\deg\ 32\hbox{$^\prime$ }\ 06\hbox{$^{\prime\prime}$ }$	$19\deg\ 32\hbox{$^\prime$ }\ 20\hbox{$.\!\!^{\prime\prime}$ }6$
X-ray: RA	04 $^{\rm h}$ 21 $^{\rm m}$ 59.44 $^{\rm s}$	04 $^{\rm h}$ 21 $^{\rm m}$ 59.42 $^{\rm s}$
X-ray: decl.	$19\deg\ 32\hbox{$^\prime$ }\ 05\hbox{$.\!\!^{\prime\prime}$ }8$	$19\deg\ 32\hbox{$^\prime$ }\ 06\hbox{$.\!\!^{\prime\prime}$ }6$
T Tau N: RA^b	04 $^{\rm h}$ 21 $^{\rm m}$ 59.43 $^{\rm s}$	04 $^{\rm h}$ 21 $^{\rm m}$ 59.43 $^{\rm s}$
T Tau N: decl.^b	$19\deg\ 32\hbox{$^\prime$ }\ 06\hbox{$.\!\!^{\prime\prime}$ }4$	$19\deg\ 32\hbox{$^\prime$ }\ 06\hbox{$.\!\!^{\prime\prime}$ }4$

^a All coordinates are J2000.0. ^b For origin of coordinates,
see Smith et al. (2003).