fprintf oc (String.join "\n" header) (String.join " " (List.map string_of_int dimInfo.dimensions)) dimInfo.size;;
(*Error: This expression has type string but an expression was expected of type
         ('a -> 'b -> 'c, out_channel, unit) format =
           ('a -> 'b -> 'c, out_channel, unit, unit, unit, unit)
           CamlinternalFormatBasics.format6*)