docs: function rows() {
          var fileTotals = filenames.reduce(reducePropToLength.bind(json), {}),
              fileOrder  = sort(fileTotals);
          return fileOrder.map(rowForFile);
  
          function rowForFile(filename) {
            var data = json[filename];
  //          console.log(JSON.stringify(data, null, 2));
            return [filename]
              .concat(columnOrder
                .map(dataForColumn)
                .map(formatFloat))
              .map(leftJustify)
              .join(' ');
  
            function dataForColumn(column) {
              return data[column];
            }
  
            function formatFloat(number) {
              var padding  = '000',
                  warning  = ((number > 99) ? '>' : ' '),
                  integer  = (padding + Math.min(99, Math.floor(number))).slice(-2),
                  fraction = (padding + Math.round(1000 * number)).slice(-3);
              return warning + integer + '.' + fraction;
            }
          }
        }