Example of IUWT wavelet multiscale decomposition of the group 2 (z = 3.07) S/N narrowband image (upper left panel). The signal is split into three channels: high, medium, and low spatial frequency. Central-lower panel: (low freq. iter 2) shows the low frequency channel after masking the medium frequency peaks in the S/N image (see Sect. 4.2). The final segmentation is shown in the lower right panel. In white the “filaments”, in red the area of compact sources included in the filaments. The diffuse area is defined as the area included in the filament (white contours) after exclusion of the compact sources (red contours). The yellow ring shows the low S/N region with less than 60 h exposure time. The figure has the MXDF orientation with north up.
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