def get_daru_columns(data, cnt)
      new_opt = (2..cnt).to_a.join(':')
      if data.index[0].is_a?(DateTime) || data.index[0].is_a?(Numeric)
        "1:#{new_opt}"
      else
        "#{new_opt}:xtic(1)"
      end
    end
def get_daru_columns(data, cnt)
      new_opt = (2..cnt).to_a.join(':')
      if data.index[0].is_a?(DateTime) || data.index[0].is_a?(Numeric)
        "1:#{new_opt}"
      else
        "#{new_opt}:xtic(1)"
      end
    end
Create new value for 'using' option based on column count