# File lib/spreadsheet/worksheet.rb, line 86
   def store_guts
      record   = 0x0080 # record identifier
      length   = 0x0008 # bytes to follow
      
      dxRwGut  = 0x0000 # size of row gutter
      dxColGut = 0x0000 # size of col gutter
      
      row_level = @outline_row_level
      col_level = 0
 
      @colinfo.each do |colinfo|
         next if colinfo.length < 6
         col_level = colinfo[5] if colinfo[5] > col_level
      end
      
      col_level = 0 if col_level < 0
      col_level = 7 if col_level > 7
      
      row_level += 1 if row_level > 0
      col_level += 1 if col_level > 0
      
      header = [record, length].pack("vv")
      fields = [dxRwGut, dxColGut, row_level, col_level]
      data   = fields.pack("vvvv")
 
      prepend(header, data)
   end