These files have (at least) the following columns (separated by white space):
column 1: chromosome
column 2: variant name
column 3: genetic distance in morgans (optional, see the
column 4: base-pair position (bp units)
logical, indicate whether input file contains column with genetic distance between SNPs (in which case the bp positions are in the fourth column)
matrix object with columns contains chromosome, rsID and position in bp
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