# File lib/spreadsheet/worksheet.rb, line 145
   def store_colinfo(first=0, last=0, coldx=8.43, ixfe=0x0F, grbit=0)
      record   = 0x007D
      length   = 0x000B

      coldx += 0.72
      coldx *= 256
      reserved = 0x00

      if ixfe.kind_of?(Format)
         ixfe = ixfe.xf_index
      end

      header = [record, length].pack("vv")
      data   = [first, last, coldx, ixfe, grbit, reserved].pack("vvvvvC")

      prepend(header,data)
   end