barcat -e --markers=+/1 input/powers_of_ten.txt
     1 
    10 -----+
   100 -----+----+
  1000 -----+----+-----+
   1e4 -----+----+-----+----+
100000 -----+----+-----+----+-----+
   1e6 -----+----+-----+----+-----+----+