RDF was calculated by shielding three adjacent beads within the same chain

[yingyingwukim]

Dear experts：
A multi-chain polymer system as shown in the figure, how can we use MDAnalysis to calculate the RDF while excluding the nearest 3 atoms within the same chain?
Here's my code using exclusion_block to exclude nearest neighbors as shown below. Could this approach correctly exclude the nearest 3 atoms within the same chain? Please help improve my code.

# 函数3-计算RDF
def compute_rdf(atom1, atom2):
    """
    计算两个原子组之间的RDF
    """
    rdf = InterRDF(atom1, atom2, nbins=200, range=(0.0,30), exclusion_block=(2, 2))
    rdf.run()
    return rdf.results.bins, rdf.results.rdf

[orbeckst]

Is this question related to #4716 ?

[yingyingwukim]

Yeah, these are all question I sent