writing to a fixed format (fortran) file

Could anyone help with what should be a simple task? I have data as a
fixed format (fortran) table. I  have no trouble getting it into R using
read.table. Each column is separated by a space, including the first
column that begins with a space, and aligned. It reads into R as if
separated by tabs. However I want to manipulate two columns of data then
write the results out into exactly the same fortran format for use in
another program.  It should be simple, but I've tried a variety of
experiments with print, cat and format, none of which have come close.

Here is a sample of the data.

  1  1    1  19.5  2.42 0.02   5.81   9.7   0.4 102.  4.8  320.   4.8
  2  1    1   0.0  0.00 0.00   0.00   4.7  -4.0 178.  5.4  301.   0.2
  3  1    1   8.2  1.64 0.08   6.93   6.9  -3.6 275.  2.7   84. -11.1
  4  1    1   0.0  0.00 0.00   0.00  20.6  -4.8 221.  5.6  327. -10.4
  5  1    1   0.0  0.00 0.00   0.00  11.6   8.2 168.  4.3  269.   6.8
  6  1    1   0.0  0.00 0.00   0.00  18.7  16.9 155.  5.6  287.   8.2
  7  1    1   0.0  0.00 0.00   0.00   7.0   2.1 195.  2.7   22.   0.1
  8  1    1   0.0  0.00 0.00   0.00  17.6   6.5 281.  2.0  146.   1.5
  9  1    1  41.2  1.54 0.82   6.96  12.2   7.8 268.  5.5  356.   4.5
 10  1    1   0.0  0.00 0.00   0.00  14.6  -1.4 250.  3.6  344.   6.4
 11  1    1   0.0  0.00 0.00   0.00  14.5  -3.7 300.  0.0    0. -16.9
 12  1    1   0.0  0.00 0.00   0.00   8.8  -2.6 308.  0.0    0.   2.9
 13  1    1   0.0  0.00 0.00   0.00   6.4   1.6 226.  3.3  335.   3.8

--

Dr Duncan Golicher
Ecologia y Sistematica Terrestre
Conservación de la Biodiversidad
El Colegio de la Frontera Sur
San Cristobal de Las Casas,
Chiapas, Mexico

Email: dgoliche at sclc.ecosur.mx