this file should be similar to panama.blk
          2
          6
         11
          1 0.5 0.5
         11  5.00000E-01  5.00000E-01 p
         11  1.50000E+00  2.50000E+00 a
         11  5.00000E-01  1.50000E+00 n
         11  5.00000E-01  2.50000E+00 a
         11  5.00000E-01  3.50000E+00 m
         11  5.00000E-01  5.50000E+00 a
         11  1.50000E+00  5.00000E-01 c
         11  1.50000E+00  1.50000E+00 a
         11  1.50000E+00  3.50000E+00 n
         11  5.00000E-01  4.50000E+00 a
         11  1.50000E+00  4.50000E+00 l
         11  1.50000E+00  5.50000E+00 white
