def meter_header(range)
      content_tag(:tr) do
        concat content_tag(:th)
        range.to_a.reverse.each { |date| concat content_tag(:th, date.strftime('%-m/%-d/%y')) }
      end
    end
def meter_header(range)
      content_tag(:tr) do
        concat content_tag(:th)
        range.to_a.reverse.each { |date| concat content_tag(:th, date.strftime('%-m/%-d/%y')) }
      end
    end
Constructs an HTML table header