Astronomy & Astrophysics

Table 2: CDS and TRACE measurements concerning the selected regions (A-E), in the loop leg (Loop), the adjacent background areas (Backgr.), and the corresponding background-subtracted values. The averaged distances along the loop (starting from the limb, where region A is) are shown in the first row. Electron densities $N_{\rm e}$ (10⁸ cm^-3) have been derived from the averaged CDS spectra and the Del Zanna et al. (2001a) calibration. Temperatures, derived from the DEM method, and total emission measures $EM = \int DEM(T) {\rm d}T$ are also shown. The bottom part shows the averaged TRACE count rates (DN s $\rm ^{-1}$ pix $\rm ^{-1}$ ) in the two bands, I (173 Å) and I (195 Å), together with their ratios.
A B C D E Region

Distances along the loop ( $^{\prime \prime }$ ) 0 8 25 40 60

$N_{\rm e}$ (Mg VII) $32\pm12$ $26\pm6$ $11\pm8$ $13\pm6$ $8\pm8$ Loop

$N_{\rm e}$ (Mg VII) $38\pm19$ $24\pm15$ $4\pm4$ $3\pm3$ $2.5\pm2.5$ Loop (backgr. sub.)

$N_{\rm e}$ (Si X 356/347.4 Å) $9\pm1$ $6.7\pm0.8$ $6.3\pm0.5$ $5.6\pm0.6$ $5.3\pm0.6$ Backgr.

$N_{\rm e}$ (Fe XIII 320.8/321.4 Å) $9\pm1$ $7.9\pm0.2$ $8.9\pm2$ $6.7\pm1$ $6.3\pm1$ Backgr.

$N_{\rm e}$ (Fe XIII 320.8/348.183 Å) $11\pm2$ $8.9\pm1$ $7.5\pm1$ $7.5\pm0.9$ $6.0\pm0.7$ Backgr.

Log $T_{\rm e}$ (K) 5.83 5.87 5.9 5.92 5.95 Loop (backgr. sub.)

EM (10²⁶ cm^-5) 19 11 4.9 1.4 0.5 Loop (backgr. sub.)

I (173 Å) $7.0\pm0.5$ $7.0\pm0.5$ $5.6\pm0.4$ $4.5\pm0.4$ $3.5\pm0.3$ Loop

I (195 Å) $6.7\pm0.6$ $6.6\pm0.5$ $5.2\pm0.5$ $4.5\pm0.4$ $3.8\pm0.4$ Loop

I (173 Å) $3.4\pm0.3$ $3.2\pm0.3$ $4.0\pm0.4$ $3.0\pm0.3$ $2.1\pm0.3$ Backgr.

I (195 Å) $3.3\pm0.4$ $4.9\pm0.5$ $5.2\pm0.5$ $4.3\pm0.4$ $3.5\pm0.4$ Backgr.

I (195 Å)/I (173 Å) $0.94\pm0.23$ $0.45\pm0.20$ - $0.13\pm0.13$ $0.21\pm0.21$ Loop (backgr. sub.)

I (195 Å)/I (173 Å) $0.96\pm0.10$ $0.94\pm0.10$ $0.93\pm0.11$ $1.0\pm0.13$ $1.09\pm0.17$ Loop

**Table 2:** CDS and TRACE measurements concerning the selected regions (A-E), in the loop leg (Loop), the adjacent background areas (Backgr.), and the corresponding background-subtracted values. The averaged distances along the loop (starting from the limb, where region A is) are shown in the first row. Electron densities $N_{\rm e}$ (10⁸ cm^-3) have been derived from the averaged CDS spectra and the Del Zanna et al. (2001a) calibration. Temperatures, derived from the *DEM* method, and total emission measures $EM = \int DEM(T) {\rm d}T$ are also shown. The bottom part shows the averaged TRACE count rates (DN s $\rm ^{-1}$ pix $\rm ^{-1}$ ) in the two bands, I (173 Å) and I (195 Å), together with their ratios.
	A	B	C	D	E	Region
Distances along the loop ( $^{\prime \prime }$ )	0	8	25	40	60
$N_{\rm e}$ (Mg VII)	$32\pm12$	$26\pm6$	$11\pm8$	$13\pm6$	$8\pm8$	Loop
$N_{\rm e}$ (Mg VII)	$38\pm19$	$24\pm15$	$4\pm4$	$3\pm3$	$2.5\pm2.5$	Loop (backgr. sub.)
$N_{\rm e}$ (Si X 356/347.4 Å)	$9\pm1$	$6.7\pm0.8$	$6.3\pm0.5$	$5.6\pm0.6$	$5.3\pm0.6$	Backgr.
$N_{\rm e}$ (Fe XIII 320.8/321.4 Å)	$9\pm1$	$7.9\pm0.2$	$8.9\pm2$	$6.7\pm1$	$6.3\pm1$	Backgr.
$N_{\rm e}$ (Fe XIII 320.8/348.183 Å)	$11\pm2$	$8.9\pm1$	$7.5\pm1$	$7.5\pm0.9$	$6.0\pm0.7$	Backgr.
Log $T_{\rm e}$ (K)	5.83	5.87	5.9	5.92	5.95	Loop (backgr. sub.)
EM (10²⁶ cm^-5)	19	11	4.9	1.4	0.5	Loop (backgr. sub.)
I (173 Å)	$7.0\pm0.5$	$7.0\pm0.5$	$5.6\pm0.4$	$4.5\pm0.4$	$3.5\pm0.3$	Loop
I (195 Å)	$6.7\pm0.6$	$6.6\pm0.5$	$5.2\pm0.5$	$4.5\pm0.4$	$3.8\pm0.4$	Loop
I (173 Å)	$3.4\pm0.3$	$3.2\pm0.3$	$4.0\pm0.4$	$3.0\pm0.3$	$2.1\pm0.3$	Backgr.
I (195 Å)	$3.3\pm0.4$	$4.9\pm0.5$	$5.2\pm0.5$	$4.3\pm0.4$	$3.5\pm0.4$	Backgr.
I (195 Å)/I (173 Å)	$0.94\pm0.23$	$0.45\pm0.20$	-	$0.13\pm0.13$	$0.21\pm0.21$	Loop (backgr. sub.)
I (195 Å)/I (173 Å)	$0.96\pm0.10$	$0.94\pm0.10$	$0.93\pm0.11$	$1.0\pm0.13$	$1.09\pm0.17$	Loop

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