Table 4: Results for the short-term variability analysis. We report only upper limits for the effective variability at the 99.7% statistical level, because the emission is compatible with the hypothesis of constant source in the cases.
   Obs. 2000Obs. 2001
$\log T_{\mathrm{max}}^{a}$ $\Delta\lambda^{b}$Ion $N_{\rm TOT}^{c}$ Veff/Id (%) $N_{\rm TOT}^{c}$ Veff/Id (%)
6.30[21.50,22.25]O VII2557 <10.32128<10.8
 [24.75,24.85]N VII     
 [43.98,44.25]Si XII     
 [45.58,45.75]Si XII     
6.50[15.95,16.05]O VIII3710 <8.62797<9.4
 [18.85,19.05]O VIII     
6.70[14.95,15.12]Fe XVII13258 <4.59966<5.0
 [15.22,15.33]Fe XVII     
 [16.70,16.90]Fe XVII     
 [16.95,17.20]Fe XVII     
6.80[9.05,9.45]Mg XI3891 <8.42980<9.1
 [12.05,12.22]Ne X     
 [93.90,94.10]Fe XVIII     
 [103.93,104.12]Fe XVIII     
6.90[14.15,14.65]Fe XVIII8005 <5.85841<6.5
 [15.55,15.70]Fe XVIII     
 [15.80,15.93]Fe XVIII     
 [16.05,16.20]Fe XVIII     
 [17.58,17.66]Fe XVIII     
 [101.55,101.70]Fe XIX     
 [108.37,108.48]Fe XIX     
7.00[6.55,6.85]Si XIII3493 <8.92465<10.0
 [8.30,8.50]Mg XII     
 [12.22,12.35]Fe XXI     
 [12.80,12.90]Fe XX     
 [118.70,118.85]Fe XX     
 [121.85,122.00]Fe XX     
 [128.75,128.92]Fe XXI     
 [132.85,133.05]Fe XXIII     

a Peak temperature of line formation.		    
b Wavelength interval used to select photons. For each Tmax value, we have analyzed together the photons extracted    
from all the listed wavelength intervals.    
c Total number of selected photons, including the background.    
d Effective fractional variability.    

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