what are the means and differences of "< |M|\S2\N >" , "< |M| >\S2\N" , "< |M|\S2\N > - < |M| >\S2\N" and "< |M| >\S2\N / < |M|\S2\N >" in .xvg file of g-dipoles command of gromacs?
gmx dipoles -a calculates the average |M|2 plus its fluctuations. \S\N is a code used by xmgrace for superscripts, so X\S2\N means that the variable X is squared.