The presence or absence and the intensity of refractive index distribution are easily controlled with high reproducibility without depending on the fabricating process accuracy. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract. Here, the optical film is characterized in that it comprises a plurality of protrusions formed on at least one of the light-incident portion and the light exit portion, wherein a plurality of the protrusions satisfies the requirements of the following Equation: 80\xd7H13\u2266P\u2266200\xd7H13 and 0. Further, a template that is an original plate having a concave-convex pattern is brought into contact with the resist to form a resist pattern on the substrate according to the concave-convex pattern. The dewaxed heavy diesel fraction can be combined with the light diesel fraction, or the dewaxed heavy diesel fraction can be fractionated as well.