Figure 9 from Tam et al. (2020) showing the low density large scale structure in a total region of 30 × 30 arcmin² around MS 0451 with the substructures (red circles) and three filaments (in green) superimposed. The orange circles are unlikely to be cluster substructures, and are possibly the projection of large-scale structures at other redshifts along the line of sight. The positions of RPS candidates of Samples 1a, 1b, 1c and 1d are respectively shown as small green, cyan, blue and red circles. The RPS candidates of Sample 2 with grades J = 1 to 3 are shown as magenta crosses, and those with J = 4 and 5 with magenta squares. The white cross indicates the position of the cluster centre. The two yellow dashed circles have radii of 0.6 × r₂₀₀ and 1.4 × r₂₀₀, corresponding to the peaks seen in Fig. 10. North is up and east is left.