Table 3: X-ray properties of the four clumps (see Fig. 4 for the definition of the clumps). Clump 3 is not detected in the X-ray data, and the numbers quoted below are $3\sigma$ limits. The coordinates correspond to the peak of the X-ray emission. The L_X luminosity is based on the extrapolation of the detected flux to R₅₀₀, described in Finoguenov et al. (2007). The total mass is computed using the scaling relations (L_X-M) with the weak lensing calibration for mass from COSMOS, achieved at a similar redshift ( $z\sim 0.9$ ) and luminosity range (Leauthaud et al. in prep.). The newly discovered clumps are assumed to lie at the same redshift as the RDCSJ0910 cluster (i.e., clump 1).
clump RA Dec $L_X\rm\ (10^{43}\ ergs\ s^{-1})$ $M_{500}\ (10^{13}~M_\odot)$

1 $09^{\rm h}\ 10^{\rm m}\ 45^{\rm s}$ $54^\circ\ 22\hbox{$^\prime$ }\ 08\hbox{$^{\prime\prime}$ }$ $7.3\pm0.9$ $8.9\pm1.0$

2 $09^{\rm h}\ 10^{\rm m}\ 09^{\rm s}$ $54^\circ\ 18\hbox{$^\prime$ }\ 56\hbox{$^{\prime\prime}$ }$ $7.5\pm1.1$ $9.0\pm1.1$

3 $09^{\rm h}\ 09^{\rm m}\ 44^{\rm s}$ $54^\circ\ 20\hbox{$^\prime$ }\ 22\hbox{$^{\prime\prime}$ }$ < $3.4\pm1.1$ < $4.8\pm1.2$

4 $09^{\rm h}\ 09^{\rm m}\ 45^{\rm s}$ $54^\circ\ 16\hbox{$^\prime$ }\ 50\hbox{$^{\prime\prime}$ }$ $3.8\pm1.3$ $5.2\pm1.4$

**Table 3:** X-ray properties of the four clumps (see Fig. 4 for the definition of the clumps). Clump 3 is not detected in the X-ray data, and the numbers quoted below are $3\sigma$ limits. The coordinates correspond to the peak of the X-ray emission. The L_X luminosity is based on the extrapolation of the detected flux to R₅₀₀, described in Finoguenov et al. (2007). The total mass is computed using the scaling relations (L_X-M) with the weak lensing calibration for mass from COSMOS, achieved at a similar redshift ( $z\sim 0.9$ ) and luminosity range (Leauthaud et al. in prep.). The newly discovered clumps are assumed to lie at the same redshift as the RDCSJ0910 cluster (i.e., clump 1).
clump	RA	Dec	$L_X\rm\ (10^{43}\ ergs\ s^{-1})$	$M_{500}\ (10^{13}~M_\odot)$
1	$09^{\rm h}\ 10^{\rm m}\ 45^{\rm s}$	$54^\circ\ 22\hbox{$^\prime$ }\ 08\hbox{$^{\prime\prime}$ }$	$7.3\pm0.9$	$8.9\pm1.0$
2	$09^{\rm h}\ 10^{\rm m}\ 09^{\rm s}$	$54^\circ\ 18\hbox{$^\prime$ }\ 56\hbox{$^{\prime\prime}$ }$	$7.5\pm1.1$	$9.0\pm1.1$
3	$09^{\rm h}\ 09^{\rm m}\ 44^{\rm s}$	$54^\circ\ 20\hbox{$^\prime$ }\ 22\hbox{$^{\prime\prime}$ }$	< $3.4\pm1.1$	< $4.8\pm1.2$
4	$09^{\rm h}\ 09^{\rm m}\ 45^{\rm s}$	$54^\circ\ 16\hbox{$^\prime$ }\ 50\hbox{$^{\prime\prime}$ }$	$3.8\pm1.3$	$5.2\pm1.4$

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