Modelling the spectral response of the Swift-XRT CCD camera: experience learnt from in-flight calibration

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Table 6:

Best fit parameters of the PC grade 0-12 spectra extracted using the 40 arcsec core of the SNR G21.5.
$V_{\rm ss}$	$N_{\rm H}$	$\Gamma$	Normalisation $^\dagger$
(V)	( $\times 10^{22}$ cm^-2)		( $\times 10^{-2}$ ph keV^-1 cm^-2 s^-1)
0	$\rm 3.26^{+0.17}_{-0.16}$	$1.92\pm 0.07$	$\rm 1.71^{+0.20}_{-0.18}$ ^*
6	$\rm 3.38^{+0.14}_{-0.13}$	$2.01\pm 0.06$	$\rm 1.84^{+0.17}_{-0.15}$ ^*

$^\dagger$ The fits were performed using a TBABS*POWERLAW model with the abundance table given by Wilms et al. (2000). No PSF correction was applied since the source is extended.
^* All the errors quoted above are given at $2.71\sigma$ .

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