def label_rotation=(v)
      Axlsx::validate_int(v)
      adjusted = v.to_i * 60000
      Axlsx::validate_angle(adjusted)
      @label_rotation = adjusted
    end
def label_rotation=(v)
      Axlsx::validate_int(v)
      adjusted = v.to_i * 60000
      Axlsx::validate_angle(adjusted)
      @label_rotation = adjusted
    end
Specify the degree of label rotation to apply to labels
 default true