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\section{Observational Dataset}  \label{sec:data}   Clusters analyzed in this work were selected from the sample of nineteen low X-ray luminosity galaxy clusters studied by Nilo Castellon et al (2014A) (hereafter paper I). The authors created a photometric and spectroscopic data base with 19 low and intermediate mass galaxy clusters in the redshift range of 0.15 to 0.70 and observed X-ray luminosities between L$_X$\sim$ L$_X$$\sim$  0.5-45$\times$10$^{43}$ erg s$^{−1}$. The clusters were observed in 4 different observatories, according to their redshift: redshift :  clusters at $z<$0.32 were observed at Las Campanas Observatory (LCO) using the 2.5mt du Pont telescope, clusters at 0.19 $< z <$ 0.30 were observed at the Cerro Tololo Interamerican Observatory (CTIO) using the Victor Blanco 4m telescope, and clusters at $z<$0.3 were observed with Gemini North (GN) and South (GS) telescopes. Also, three clusters at $z<$0.3 were observed with the 8mts Gemini telescopes in order to observed the faintest galaxies in these cluster (for further details see Paper I). The study of the faintest detections in the images is a major concern in our work ({\bf algo por el estilo quiero agregar}). In order to this, we select a subsample of 7 galaxy clusters, all of them observed with the Gemini North and South telescopes. the clusters were observed using the Multi-Object Spectrograph (Hook et al. 2004, hereafter GMOS) in the image mode, with $g\prime$, $r\prime$ and $i\prime$ filters. All the observations were carried under good and excelente photometric conditions with mean seeing values of 0.75, 0.66 and 0.74 arcsec in the$g\prime$, $r\prime$ and $i\prime$ filters, respectively. Reaching in the case of the cluster [VMF98]001, median seeing of about 0.485 in the $r\prime$ image (For forther details about the observation strategy see Nilo Castellon et al. (2014B)).