# Space between columns in an index

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Hi there folks
I'm just writing up my thesis for my PhD, and I'm having problems with the index. I'm using the package makeidx', which sorts everything out for you, and prints an index in two columns. Unfortunately it doesn't put any space between the columns, and at one point in my index an entry in the left hand column overlaps an entry in the right hand column. Does anyone know how to put a central margin' in?