An optical film which comprises a transparent resin layer made of a photo-curable resin having a self-healing property, an antireflection layer present on one side of the transparent resin layer, and a color tone correcting layer containing a colorant which has a color tone correcting property, present on the other side of the transparent resin layer opposite from the antireflection layer. The roof rack includes a rail secured between first and second stanchions. The thermoformer’s platens clamp a shroud over the sheet. Based on the displayed contents, the operator can appropriately evaluate the analytic model.