Table 4: Spectral properties of BDs obtained from quantile analysis. Column (3) gives the instrument name (MOS stands for MOS1+MOS2). Column (4) and (5) indicate the exposure and the net source counts collected by this instrument (i.e. for MOS the exposure average and the sum of net source counts). Column (6) gives the energies below which the net counts are 25%, 50%, and 75% of the source net counts in the 0.5-7.3 keV energy range. The resulting position in the quantile diagram (Fig. 5) is given in Col. (7). The observed optical extinctions (see Table 1) were used to disentangle temperature double solutions in the quantile diagram (#2 on pn), and to estimate the hydrogen column density (Col. 8) for sources with low constraint in the quantile diagram (#2, #6 and #7 on pn, and #9 on MOS), using the relation $N_{\rm H} = 1.6 \times 10^{21} A_{\rm V}$ cm^-2 mag^-1 (Cardelli et al. 1989; Vuong et al. 2003); these values are between brackets in Col. 8. Where negligible optical extinction was measured, we adopted $N_{\rm H} = 0.1 \times 10^{21}$ cm^-2. When no constraint on the plasma temperature was obtained, we adopted 1 keV (value between brackets in Col. 9). The X-ray luminosity in the 0.5-8 keV energy range corrected for absorption in Col. (10) was computed assuming a distance of 140 pc for the TMC. The X-ray fractional luminosity, $\eta=\log (L_{\rm X}/L_*)$ , is given in the last column.
BD name Instr. Exp. N $E_{\rm 25\%}/E_{\rm 50\%}/E_{\rm 75\%}$ (x, y) $N_{\rm H}$ kT $L_{\rm X}$ $\eta$

# ks keV 10²¹ cm^-2 keV 10²⁸ erg s^-1

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

2 KPNO-Tau 5 pn 17.2 25.3 0.71 / 0.82 / 1.02 (-1.31, 1.21) [0.1] 0.2 0.8 -4.1

4a CFHT-Tau 5 pn 26.1 118.4 1.08 / 1.45 / 1.89 (-0.79, 1.25) 6.4 1.4 13.9 -3.3

4b CFHT-Tau 5 MOS 22.9 26.6 1.02 / 1.27 / 1.60 (-0.90, 1.42) 11.1 0.5 20.1 -3.2

5 CFHT-BD-Tau 1 pn 20.6 64.7 1.11 / 1.36 / 1.98 (-0.84, 1.24) 4.5 1.5 12.4 -2.7

6 CFHT-BD-Tau 3 pn 23.9 11.6 0.79 / 0.98 / 1.19 (-1.12, 1.27) [0.1] [1] 0.6 -3.7

7 CFHT-Tau 6 pn 14.2 31.8 0.92 / 0.98 / 1.26 (-1.13, 1.65) [0.7] 0.1 2.8 -3.5

9 2MASS J0455 MOS 123.9 5.0 0.75 / 0.95 / 1.15 (-1.15, 1.14) [0.1] [1] 0.2 -4.5

**Table 4:** Spectral properties of BDs obtained from quantile analysis. Column (3) gives the instrument name (MOS stands for MOS1+MOS2). Column (4) and (5) indicate the exposure and the net source counts collected by this instrument (i.e. for MOS the exposure average and the sum of net source counts). Column (6) gives the energies below which the net counts are 25%, 50%, and 75% of the source net counts in the 0.5-7.3 keV energy range. The resulting position in the quantile diagram (Fig. 5) is given in Col. (7). The observed optical extinctions (see Table 1) were used to disentangle temperature double solutions in the quantile diagram (#2 on pn), and to estimate the hydrogen column density (Col. 8) for sources with low constraint in the quantile diagram (#2, #6 and #7 on pn, and #9 on MOS), using the relation $N_{\rm H} = 1.6 \times 10^{21} A_{\rm V}$ cm^-2 mag^-1 (Cardelli et al. 1989; Vuong et al. 2003); these values are between brackets in Col. 8. Where negligible optical extinction was measured, we adopted $N_{\rm H} = 0.1 \times 10^{21}$ cm^-2. When no constraint on the plasma temperature was obtained, we adopted 1 keV (value between brackets in Col. 9). The X-ray luminosity in the 0.5-8 keV energy range corrected for absorption in Col. (10) was computed assuming a distance of 140 pc for the TMC. The X-ray fractional luminosity, $\eta=\log (L_{\rm X}/L_*)$ , is given in the last column.
	BD name	Instr.	Exp.	N	$E_{\rm 25\%}/E_{\rm 50\%}/E_{\rm 75\%}$	(x, y)	$N_{\rm H}$	kT	$L_{\rm X}$	$\eta$
#			ks		keV		10²¹ cm^-2	keV	10²⁸ erg s^-1
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)
2	KPNO-Tau 5	pn	17.2	25.3	0.71 / 0.82 / 1.02	(-1.31, 1.21)	[0.1]	0.2	0.8	-4.1
4a	CFHT-Tau 5	pn	26.1	118.4	1.08 / 1.45 / 1.89	(-0.79, 1.25)	6.4	1.4	13.9	-3.3
4b	CFHT-Tau 5	MOS	22.9	26.6	1.02 / 1.27 / 1.60	(-0.90, 1.42)	11.1	0.5	20.1	-3.2
5	CFHT-BD-Tau 1	pn	20.6	64.7	1.11 / 1.36 / 1.98	(-0.84, 1.24)	4.5	1.5	12.4	-2.7
6	CFHT-BD-Tau 3	pn	23.9	11.6	0.79 / 0.98 / 1.19	(-1.12, 1.27)	[0.1]	[1]	0.6	-3.7
7	CFHT-Tau 6	pn	14.2	31.8	0.92 / 0.98 / 1.26	(-1.13, 1.65)	[0.7]	0.1	2.8	-3.5
9	2MASS J0455	MOS	123.9	5.0	0.75 / 0.95 / 1.15	(-1.15, 1.14)	[0.1]	[1]	0.2	-4.5

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