Distribution of the matter density in dependence of the distance for our catalogues. Dotted black line: expected average value based on the mock catalogue used to calibrate the group masses. Dotted blue line: density distribution of our SDSS catalogue. Dashed green line: density distribution of our 2MRS catalogue. Solid red line: density distribution of our combined dataset, which is a mixture of the SDSS and 2MRS cataloguesbelow the distance at which the SDSS saturation limit becomes negligible. Dashed-dotted cyan line: only the SDSS catalogue is used above this distance. Dotted magenta line: maximum depth of catalogue (z = 0.11).
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