Plastic logs having a smooth, textured, glossy surface with a nominal diameter greater than 2 inches and a flexural modulus at 40 F. An apparatus and computer program element for determining such relationship data are also provided. Said carboxylic acid in said sample is then quantitatively converted to a chemical compound of identical structure, except the stable isotope atoms, as that of said internal standard using a non-labeled reagent. Then, the HDDVD layer is reproduced while lighting of the blue laser beam is maintained.