... estimates

The spectral index of each radio source was estimated by fitting a power-law to the flux density measurement available at 74, 240, 325, 610 and 1400 MHz (Tasse et al. 2006,2007; Condon et al. 1998). For the radio sources detected in only one band, we have assumed a spectral index $\alpha = -0.8$.

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... point

Many of the galaxies in this cluster are saturated in the i-band optical image. The redshift that has been associated with this cluster following our method is the photometric redshift of background optical objects aligned with the X-ray cluster. This leads to an incorrect estimate of its X-ray luminosity.

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