rs0000  11        0.000000               0 A C
              rs1111  11        0.001000          100000 A G
              rs2222  11        0.002000          200000 A T
              rs3333  11        0.003000          300000 C A
              rs4444  11        0.004000          400000 G A
              rs5555  11        0.005000          500000 T A
              rs6666  11        0.006000          600000 G T