Surface brightness in J band, IJ, as a function of the K band, IK, (upper frame) and IH as a function of IK (lower frame) for the main filament area shown in Fig. 2. The y = x function is denoted by a black line. The colour scale of the 2D histogram indicates the logarithmic density of the points, both here and in other figures. The data are convolved to 40 resolution.
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