**Table 2:** Inter-calibration constants for the X-ray light curves.
Energy [keV]	RXTE	BeppoSAX/LECS	BeppoSAX/MECS	BeppoSAX/PDS	XMM/PN	INTEGRAL	Swift/XRT
0.5	-	$1.67 \pm 0.07$	-	-	1	-	4.87^a
1	-	$1.35 \pm 0.02$	-	-	1	-	4.87^a
2	-	-	0.87 $\pm$ 0.02	-	1	-	4.87^a
5	0.77 $\pm$ 0.12	-	1	-	1	1	4.87^b $\pm$ 1.27
10	0.78 $\pm$ 0.15	-	1	-	1	1	-
20	0.78^c	-	-	1	-	1	-
50	0.78^c	-	-	1	-	1	-
100	0.78^c	-	-	1	-	1	-
200	-	-	-	1	-	1	-
Renormalised to	XMM/PN	XMM/PN	XMM/PN	RXTE	-	RXTE	RXTE

^a Fixed to the value found at 5 keV. ^b This large scaling factor is due to the pile-up affecting the XRT images of 3C 273 and it does not have to be considered as an inter-calibration constant between Swift/XRT and RXTE. ^c Fixed to the value found at 10 keV.

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