Left: clustercentric radius vs. line-of-sight velocity for the sample of CLASH galaxies with 0.3 <  z <  0.4. Both galaxies with middle-resolution and low-resolution observations are shown. The red points which fall within the 3σ contours of the trumpet-shaped caustic profile (dark-grey area) are classified as R2248 cluster galaxies. The blue diamonds located between 3σ and 6σ (light-grey area) contours are considered to be galaxies from the near field, whereas the black squares located beyond the 6σ contours of the caustic are classified as far-field galaxies. Only the red symbols are considered for the computation of the cluster specific parameters such as R₂₀₀ and M₂₀₀. The dashed black line shows R₂₀₀. The large symbols represent the galaxies with middle-resolution observations while the small ones represent the galaxies observed with a low-resolution grism, for which no flux measurements of ELs other than [OII] are available. Right-top: histogram showing the clustercentric radius normalised to R₂₀₀ for the R2248 cluster members with low-resolution observations (black) and middle-resolution observations (red). The dotted lines show the median value for of both samples, colour coded accordingly. Right-bottom: histogram showing Δv normalised to the clusters velocity dispersion σ for the R2248 cluster members with low-resolution observations (black) and middle-resolution observations (red). The dotted lines represent the median values for of both samples, colour coded accordingly.