Hi Somak, sorry for coming back to you only now. I could reretrieve all the ZWCL data from ESO, reprocess them and create a colour catalogue for you. Everything is on http://marvinweb.astro.uni-bonn.de/data_products/ZWCL2341 There you find: - ZWCL2341_R.V1.11A.swarp.cut.fits etc. reprocessed R and B-band images; as the old ones were done six years ago I decided to redo things completely with my newest pipeline. The image headers contain all necessary information such as seeing, magnitude zeropint, gain. There were no suitable standard stars and most images uffered from quite some extinction. I hence determined zeropoints manually by adapting galaxy number counts to known ones. Hence the photometry certainly is not better than 0.1-0.2 mag in both bands. - ZWCL2341_gal.asc A colour catalogue with positions, R- and B-band magnitudes and errors; I rejected obvious stars and objects falling within image masks (see below) - ZWCL2341_gal_ellipse.reg A ds9 region file which you can overlay to the image within ds9 to visualise the galaxies in ZWCL2341_gal.asc - ZWCL2341_mask_all.reg The image mask I created for the field (also in ds9 format). Objects falling within masked regions were excluded from the galaxy catalogue. Plotting B-R colours from the catalogue around the filament region clearly shows some red sequence! Please let me know if you need anything else. bye, Thomas