Table 1: Summary of the data used to build the spectral energy distribution of Q0056-363. C03: Cutri et al. (2003). M03: Monet et al. (2003). UVW2 is the OM filter used during the present XMM-Newton observation. G99: Grupe et al. (1999). INES: Merged Log of IUE Observations (NASA-ESA, 1999).
Filter magnitude or flux Observation date reference

wavelength or energy band

$K_{\rm s}$ $12.301\pm0.032$ mag 07/1999 C03

H $13.390\pm0.044$ mag 07/1999 C03

J $14.228\pm0.037$ mag 07/1999 C03

I 14.69 mag 02/1987 M03

[6600-7820 Å] (Red) (spectrum) 10/1993 G99

[4640-5950 Å] (Blue) (spectrum) 10/1993 G99

OM (UWV2) $2.11\pm0.04$ erg cm^-2 s^-1 A^-1 07/2000 this work

IUE (UV: [1151-1979 Å]) (spectrum) 10/1995 INES

XMM (X-rays: 0.3-10 keV) (spectrum) 07/2000 this work

**Table 1:** Summary of the data used to build the spectral energy distribution of Q0056-363. C03: Cutri et al. (2003). M03: Monet et al. (2003). UVW2 is the OM filter used during the present *XMM-Newton* observation. G99: Grupe et al. (1999). INES: Merged Log of *IUE* Observations (NASA-ESA, 1999).
Filter	magnitude or flux	Observation date	reference
wavelength or energy band
$K_{\rm s}$	$12.301\pm0.032$ mag	07/1999	C03
H	$13.390\pm0.044$ mag	07/1999	C03
J	$14.228\pm0.037$ mag	07/1999	C03
I	14.69 mag	02/1987	M03
[6600-7820 Å] (Red)	(spectrum)	10/1993	G99
[4640-5950 Å] (Blue)	(spectrum)	10/1993	G99
OM (UWV2)	$2.11\pm0.04$ erg cm^-2 s^-1 A^-1	07/2000	this work
IUE (UV: [1151-1979 Å])	(spectrum)	10/1995	INES
XMM (X-rays: 0.3-10 keV)	(spectrum)	07/2000	this work

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