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I guess we clearly do not understand what you mean when you say:
I suggested using sort -t, -k2,2n medium.txt
which you say produced the output:
58,1
30,2
39,3
57,3
72,3
61,5
7,5
85,6
23,7...

The standard way to perform an increasing numeric sort on the 2nd field in a comma separated file would be:
sort -t, -k2,2n file
And the -g option is an extension not mentioned by the standards.
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