Table B.1: Best-fit values of temperature, emission measure and metallicity (with 90% confidence errors) relevant to the thermal component of the model describing the flaring plasma; for each segment, the (approximated) number of counts in the PN spectrum is also reported.
    Variable z   Fixed z
Segment Counts $T_{\rm obs}$ EM z   $T_{\rm obs}$ EM
    (107 K) (1052 cm-3)     (107 K) (1052 cm-3)
r 3600 $\rm 4.2^{+1.6}_{-1.0}$ $\rm 4.6^{+1.6}_{-1.5}$ 1 (<2.9)   $\rm 4.2^{+1.3}_{-0.9}$ $\rm 4.9^{+0.3}_{-0.6}$
p1 4800 $\rm 3.3^{+0.7}_{-0.6}$ $\rm 9.3^{+1.9}_{-1.8}$ $\rm0.5^{+0.7}_{-0.4}$   $\rm 3.4^{+0.5}_{-0.4}$ $\rm 8.5^{+0.6}_{-0.5}$
p2a 4700 $\rm 1.86^{+0.4}_{-0.25}$ $\rm 10.0^{+1.9}_{-1.8}$ $\rm0.30^{+0.26}_{-0.17}$   $\rm 2.2^{+0.25}_{-0.3}$ $\rm 7.4^{+0.6}_{-0.5}$
d1 4000 $\rm 1.43^{+1.6}_{-0.23}$ $\rm 6.5^{+1.9}_{-1.7}$ $\rm0.27^{+0.27}_{-0.15}$   $\rm 1.68^{+0.20}_{-0.25}$ $\rm 4.2^{+0.4}_{-0.7}$
d2 4100 $\rm 1.8^{+0.5}_{-0.3}$ $3.1 \pm 0.5$ 0.27b   2.0+0.6-0.3 $\rm 2.1^{+0.4}_{-0.4}$
p3 4800 $\rm 2.4^{+1.4}_{-0.8}$ $\rm 2.4^{+1.1}_{-1.3}$ 0.48 (<2.8)   $\rm 2.5^{+1.1}_{-0.6}$ $\rm 2.0^{+0.3}_{-0.3}$
a The agreement between data and model in the case of fixed z is not good ( $P(\chi > \chi_{\rm obs}) = 0.6\%$).
b Fixed to the value of segment d1.

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